diff --git a/CMakeLists.txt b/CMakeLists.txt
index fc7510ee..a4ddadf4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,6 +19,12 @@ project(
     LANGUAGES CXX
 )
 
+# See notes in GNUmakefile about using abi-compliance-checker.
+# soversion is major ABI version.
+set( abi_version 1.0.0 )
+string( REPLACE "." ";" abi_list "${abi_version}" )
+list( GET abi_list 0 soversion )
+
 include( CheckCXXCompilerFlag )
 
 # When built as a sub-project, add a namespace to make targets unique,
@@ -113,6 +119,8 @@ use_cmake_find_lapack  = ${use_cmake_find_lapack}
 gpu_backend            = ${gpu_backend}
 lapackpp_is_project    = ${lapackpp_is_project}
 lapackpp_              = ${lapackpp_}
+abi_version            = ${abi_version}
+soversion              = ${soversion}
 " )
 
 #-------------------------------------------------------------------------------
@@ -684,6 +692,8 @@ set_target_properties(
     CXX_STANDARD_REQUIRED true  # prohibit < c++17
     CXX_EXTENSIONS false        # prohibit gnu++17
     WINDOWS_EXPORT_ALL_SYMBOLS ON
+    VERSION   "${abi_version}"
+    SOVERSION "${soversion}"
 )
 
 if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.15)
diff --git a/GNUmakefile b/GNUmakefile
index 1b66f6fd..e44d8c0d 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -13,14 +13,14 @@
 #   AR, RANLIB      -- Archiver, ranlib updates library TOC
 #   prefix          -- where to install LAPACK++
 
-ifeq ($(MAKECMDGOALS),config)
+ifeq (${MAKECMDGOALS},config)
     # For `make config`, don't include make.inc with previous config;
     # force re-creating make.inc.
     .PHONY: config
     config: make.inc
 
     make.inc: force
-else ifneq ($(findstring clean,$(MAKECMDGOALS)),clean)
+else ifneq ($(findstring clean,${MAKECMDGOALS}),clean)
     # For `make clean` or `make distclean`, don't include make.inc,
     # which could generate it. Otherwise, include make.inc.
     include make.inc
@@ -37,139 +37,166 @@ make.inc:
 RANLIB   ?= ranlib
 prefix   ?= /opt/slate
 
+abs_prefix := ${abspath ${prefix}}
+
 # Default LD=ld won't work; use CXX. Can override in make.inc or environment.
-ifeq ($(origin LD),default)
-    LD = $(CXX)
+ifeq (${origin LD},default)
+    LD = ${CXX}
 endif
 
+# Use abi-compliance-checker to compare the ABI (application binary
+# interface) of 2 releases. Changing the ABI does not necessarily change
+# the API (application programming interface). Rearranging a struct or
+# changing a by-value argument from int64 to int doesn't change the
+# API--no source code changes are required, just a recompile.
+#
+# if structs or routines are changed or removed:
+#     bump major version and reset minor, revision = 0;
+# else if structs or routines are added:
+#     bump minor version and reset revision = 0;
+# else (e.g., bug fixes):
+#     bump revision
+#
+# soversion is major ABI version.
+abi_version = 1.0.0
+soversion = ${word 1, ${subst ., ,${abi_version}}}
+
+#-------------------------------------------------------------------------------
+ldflags_shared = -shared
+
 # auto-detect OS
 # $OSTYPE may not be exported from the shell, so echo it
-ostype := $(shell echo $${OSTYPE})
-ifneq ($(findstring darwin, $(ostype)),)
+ostype := ${shell echo $${OSTYPE}}
+ifneq ($(findstring darwin, ${ostype}),)
     # MacOS is darwin
     macos = 1
+    # MacOS needs shared library's path set, and shared library version.
+    ldflags_shared += -install_name @rpath/${notdir $@} \
+                      -current_version ${abi_version} \
+                      -compatibility_version ${soversion}
+    so = dylib
+    so2 = .dylib
+    # on macOS, .dylib comes after version: libfoo.4.dylib
+else
+    # Linux needs shared library's soname.
+    ldflags_shared += -Wl,-soname,${notdir ${lib_soname}}
+    so = so
+    so1 = .so
+    # on Linux, .so comes before version: libfoo.so.4
 endif
 
 #-------------------------------------------------------------------------------
 # if shared
-ifneq ($(static),1)
+ifneq (${static},1)
     CXXFLAGS += -fPIC
     LDFLAGS  += -fPIC
-    lib_ext = so
+    lib_ext = ${so}
 else
     lib_ext = a
 endif
 
-#-------------------------------------------------------------------------------
-# MacOS needs shared library's path set
-ifeq ($(macos),1)
-    install_name = -install_name @rpath/$(notdir $@)
-else
-    install_name =
-endif
-
 #-------------------------------------------------------------------------------
 # Files
 
-lib_src  = $(wildcard src/*.cc src/cuda/*.cc src/rocm/*.cc src/onemkl/*.cc src/stub/*.cc)
-lib_obj  = $(addsuffix .o, $(basename $(lib_src)))
-dep     += $(addsuffix .d, $(basename $(lib_src)))
+lib_src  = ${wildcard src/*.cc src/cuda/*.cc src/rocm/*.cc src/onemkl/*.cc src/stub/*.cc}
+lib_obj  = ${addsuffix .o, ${basename ${lib_src}}}
+dep     += ${addsuffix .d, ${basename ${lib_src}}}
+
+tester_src = ${wildcard test/*.cc}
+tester_obj = ${addsuffix .o, ${basename ${tester_src}}}
+dep       += ${addsuffix .d, ${basename ${tester_src}}}
 
-tester_src = $(wildcard test/*.cc)
-tester_obj = $(addsuffix .o, $(basename $(tester_src)))
-dep       += $(addsuffix .d, $(basename $(tester_src)))
+tester = test/tester
 
-tester     = test/tester
+pkg = lib/pkgconfig/lapackpp.pc
 
 #-------------------------------------------------------------------------------
 # BLAS++
 # todo: should configure.py save blaspp_dir & testsweeper_dir in make.inc?
 # Order here (./blaspp, ../blaspp) is reverse of order in configure.py.
 
-blaspp_dir = $(wildcard ./blaspp)
-ifeq ($(blaspp_dir),)
-    blaspp_dir = $(wildcard ../blaspp)
+blaspp_dir = ${wildcard ./blaspp}
+ifeq (${blaspp_dir},)
+    blaspp_dir = ${wildcard ../blaspp}
 endif
 
-blaspp_src = $(wildcard $(blaspp_dir)/src/*.cc $(blaspp_dir)/include/*.hh)
+blaspp_src = ${wildcard ${blaspp_dir}/src/*.cc ${blaspp_dir}/include/*.hh}
 
-libblaspp  = $(blaspp_dir)/lib/libblaspp.$(lib_ext)
+blaspp = ${blaspp_dir}/lib/libblaspp.${lib_ext}
 
-blaspp: $(libblaspp)
+blaspp: ${blaspp}
 
-ifneq ($(blaspp_dir),)
-    $(libblaspp): $(libblaspp_src)
-		cd $(blaspp_dir) && $(MAKE) lib CXX=$(CXX)
+ifneq (${blaspp_dir},)
+    ${blaspp}: ${blaspp_src}
+		cd ${blaspp_dir} && ${MAKE} lib CXX=${CXX}
 else
-    $(lib_obj):
-		$(error LAPACK++ requires BLAS++, which was not found. Run 'make config' \
-		        or download manually from https://github.com/icl-utk-edu/blaspp)
+    ${blaspp}:
+		${error LAPACK++ requires BLAS++, which was not found. Run 'make config' \
+		        or download manually from https://github.com/icl-utk-edu/blaspp}
 endif
 
 # Compile BLAS++ before LAPACK++.
-$(lib_obj) $(tester_obj): | $(libblaspp)
+${lib_obj} ${tester_obj}: | ${blaspp}
 
 
 #-------------------------------------------------------------------------------
 # TestSweeper
-# Order here (./testsweeper, ../testsweeper) is reverse of order in configure.py.
 
-testsweeper_dir = $(wildcard ./testsweeper)
-ifeq ($(testsweeper_dir),)
-    testsweeper_dir = $(wildcard $(blaspp_dir)/testsweeper)
+testsweeper_dir = ${wildcard ../testsweeper}
+ifeq (${testsweeper_dir},)
+    testsweeper_dir = ${wildcard ${blaspp_dir}/testsweeper}
 endif
-ifeq ($(testsweeper_dir),)
-    testsweeper_dir = $(wildcard ../testsweeper)
+ifeq (${testsweeper_dir},)
+    testsweeper_dir = ${wildcard ./testsweeper}
 endif
 
-testsweeper_src = $(wildcard $(testsweeper_dir)/testsweeper.cc $(testsweeper_dir)/testsweeper.hh)
+testsweeper_src = ${wildcard ${testsweeper_dir}/testsweeper.cc ${testsweeper_dir}/testsweeper.hh}
 
-testsweeper = $(testsweeper_dir)/libtestsweeper.$(lib_ext)
+testsweeper = ${testsweeper_dir}/libtestsweeper.${lib_ext}
 
-testsweeper: $(testsweeper)
+testsweeper: ${testsweeper}
 
-ifneq ($(testsweeper_dir),)
-    $(testsweeper): $(testsweeper_src)
-		cd $(testsweeper_dir) && $(MAKE) lib CXX=$(CXX)
+ifneq (${testsweeper_dir},)
+    ${testsweeper}: ${testsweeper_src}
+		cd ${testsweeper_dir} && ${MAKE} lib CXX=${CXX}
 else
-    $(tester_obj):
-		$(error Tester requires TestSweeper, which was not found. Run 'make config' \
-		        or download manually from https://github.com/icl-utk-edu/testsweeper)
+    ${testsweeper}:
+		${error Tester requires TestSweeper, which was not found. Run 'make config' \
+		        or download manually from https://github.com/icl-utk-edu/testsweeper}
 endif
 
 # Compile TestSweeper before LAPACK++.
-$(lib_obj) $(tester_obj): | $(libblaspp)
-
+${lib_obj} ${tester_obj}: | ${testsweeper}
 
 #-------------------------------------------------------------------------------
 # Get Mercurial id, and make version.o depend on it via .id file.
 
-ifneq ($(wildcard .git),)
-    id := $(shell git rev-parse --short HEAD)
-    src/version.o: CXXFLAGS += -DLAPACKPP_ID='"$(id)"'
+ifneq (${wildcard .git},)
+    id := ${shell git rev-parse --short HEAD}
+    src/version.o: CXXFLAGS += -DLAPACKPP_ID='"${id}"'
 endif
 
-last_id := $(shell [ -e .id ] && cat .id || echo 'NA')
-ifneq ($(id),$(last_id))
+last_id := ${shell [ -e .id ] && cat .id || echo 'NA'}
+ifneq (${id},${last_id})
     .id: force
 endif
 
 .id:
-	echo $(id) > .id
+	echo ${id} > .id
 
 src/version.o: .id
 
 #-------------------------------------------------------------------------------
 # LAPACK++ specific flags and libraries
 CXXFLAGS += -I./include
-CXXFLAGS += -I$(blaspp_dir)/include
+CXXFLAGS += -I${blaspp_dir}/include
 
 # additional flags and libraries for testers
-$(tester_obj): CXXFLAGS += -I$(testsweeper_dir)
+${tester_obj}: CXXFLAGS += -I${testsweeper_dir}
 
-TEST_LDFLAGS += -L./lib -Wl,-rpath,$(abspath ./lib)
-TEST_LDFLAGS += -L$(blaspp_dir)/lib -Wl,-rpath,$(abspath $(blaspp_dir)/lib)
-TEST_LDFLAGS += -L$(testsweeper_dir) -Wl,-rpath,$(abspath $(testsweeper_dir))
+TEST_LDFLAGS += -L./lib -Wl,-rpath,${abspath ./lib}
+TEST_LDFLAGS += -L${blaspp_dir}/lib -Wl,-rpath,${abspath ${blaspp_dir}/lib}
+TEST_LDFLAGS += -L${testsweeper_dir} -Wl,-rpath,${abspath ${testsweeper_dir}}
 TEST_LIBS    += -llapackpp -lblaspp -ltestsweeper
 
 #-------------------------------------------------------------------------------
@@ -177,68 +204,93 @@ TEST_LIBS    += -llapackpp -lblaspp -ltestsweeper
 .DELETE_ON_ERROR:
 .SUFFIXES:
 .PHONY: all docs hooks lib src test tester headers include clean distclean
-.DEFAULT_GOAL := all
+.DEFAULT_GOAL = all
 
 all: lib tester hooks
 
-pkg = lib/pkgconfig/lapackpp.pc
-
-install: lib $(pkg)
-	mkdir -p $(DESTDIR)$(prefix)/include/lapack
-	mkdir -p $(DESTDIR)$(prefix)/lib$(LIB_SUFFIX)
-	mkdir -p $(DESTDIR)$(prefix)/lib$(LIB_SUFFIX)/pkgconfig
-	cp include/*.hh $(DESTDIR)$(prefix)/include
-	cp include/lapack/*.h  $(DESTDIR)$(prefix)/include/lapack
-	cp include/lapack/*.hh $(DESTDIR)$(prefix)/include/lapack
-	cp -R lib/lib* $(DESTDIR)$(prefix)/lib$(LIB_SUFFIX)
-	cp $(pkg) $(DESTDIR)$(prefix)/lib$(LIB_SUFFIX)/pkgconfig/
-	cd $(blaspp_dir) && make install prefix=$(prefix)
+install: lib ${pkg}
+	mkdir -p ${DESTDIR}${abs_prefix}/include/lapack
+	mkdir -p ${DESTDIR}${abs_prefix}/lib${LIB_SUFFIX}/pkgconfig
+	cp include/*.hh        ${DESTDIR}${abs_prefix}/include/
+	cp include/lapack/*.h  ${DESTDIR}${abs_prefix}/include/lapack/
+	cp include/lapack/*.hh ${DESTDIR}${abs_prefix}/include/lapack/
+	cp -av ${lib_name}*    ${DESTDIR}${abs_prefix}/lib${LIB_SUFFIX}/
+	cp ${pkg}              ${DESTDIR}${abs_prefix}/lib${LIB_SUFFIX}/pkgconfig/
+	cd ${blaspp_dir} && make install prefix=${prefix}
 
 uninstall:
-	$(RM)    $(DESTDIR)$(prefix)/include/lapack.hh
-	$(RM) -r $(DESTDIR)$(prefix)/include/lapack
-	$(RM) $(DESTDIR)$(prefix)/lib$(LIB_SUFFIX)/liblapackpp.*
-	$(RM) $(DESTDIR)$(prefix)/lib$(LIB_SUFFIX)/pkgconfig/lapackpp.pc
+	${RM}    ${DESTDIR}${abs_prefix}/include/lapack.hh
+	${RM} -r ${DESTDIR}${abs_prefix}/include/lapack
+	${RM}    ${DESTDIR}${abs_prefix}/lib${LIB_SUFFIX}/${notdir ${lib_name}*}
+	${RM}    ${DESTDIR}${abs_prefix}/lib${LIB_SUFFIX}/pkgconfig/lapackpp.pc
 
 #-------------------------------------------------------------------------------
 # if re-configured, recompile everything
-$(lib_obj) $(tester_obj): make.inc
+${lib_obj} ${tester_obj}: make.inc
 
 #-------------------------------------------------------------------------------
-# LAPACK++ library
-lib_a  = lib/liblapackpp.a
-lib_so = lib/liblapackpp.so
-lib    = lib/liblapackpp.$(lib_ext)
-
-$(lib_so): $(lib_obj)
+# Generic rule for shared libraries.
+# For libfoo.so version 4.5.6, this creates libfoo.so.4.5.6 and symlinks
+# libfoo.so.4 -> libfoo.so.4.5.6
+# libfoo.so   -> libfoo.so.4
+#
+# Needs [private] variables set (shown with example values):
+# LDFLAGS     = -L/path/to/lib
+# LIBS        = -lmylib
+# lib_obj     = src/foo.o src/bar.o
+# lib_so_abi  = libfoo.so.4.5.6
+# lib_soname  = libfoo.so.4
+# abi_version = 4.5.6
+# soversion   = 4
+%.${lib_ext}:
 	mkdir -p lib
-	$(LD) $(LDFLAGS) -shared $(install_name) $(lib_obj) $(LIBS) -o $@
+	${LD} ${LDFLAGS} ${ldflags_shared} ${LIBS} ${lib_obj} -o ${lib_so_abi}
+	ln -fs ${notdir ${lib_so_abi}} ${lib_soname}
+	ln -fs ${notdir ${lib_soname}} $@
 
-$(lib_a): $(lib_obj)
+# Generic rule for static libraries, creates libfoo.a.
+# The library should depend only on its objects.
+%.a:
 	mkdir -p lib
-	$(RM) $@
-	$(AR) cr $@ $(lib_obj)
-	$(RANLIB) $@
+	${RM} $@
+	${AR} cr $@ $^
+	${RANLIB} $@
+
+#-------------------------------------------------------------------------------
+# LAPACK++ library
+# so     is like libfoo.so       or libfoo.dylib
+# so_abi is like libfoo.so.4.5.6 or libfoo.4.5.6.dylib
+# soname is like libfoo.so.4     or libfoo.4.dylib
+lib_name   = lib/liblapackpp
+lib_a      = ${lib_name}.a
+lib_so     = ${lib_name}.${so}
+lib        = ${lib_name}.${lib_ext}
+lib_so_abi = ${lib_name}${so1}.${abi_version}${so2}
+lib_soname = ${lib_name}${so1}.${soversion}${so2}
+
+${lib_so}: ${lib_obj}
+
+${lib_a}: ${lib_obj}
 
 # sub-directory rules
-lib src: $(lib)
+lib src: ${lib}
 
 lib/clean src/clean:
-	$(RM) lib/*.a lib/*.so src/*.o
+	${RM} ${lib_a} ${lib_so} ${lib_so_abi} ${lib_soname} ${lib_obj}
 
 #-------------------------------------------------------------------------------
 # tester
-$(tester): $(tester_obj) $(lib) $(testsweeper) $(libblaspp)
-	$(LD) $(TEST_LDFLAGS) $(LDFLAGS) $(tester_obj) \
-		$(TEST_LIBS) $(LIBS) -o $@
+${tester}: ${tester_obj} ${lib} ${testsweeper} ${blaspp}
+	${LD} ${TEST_LDFLAGS} ${LDFLAGS} ${tester_obj} \
+		${TEST_LIBS} ${LIBS} -o $@
 
 # sub-directory rules
 # Note 'test' is sub-directory rule; 'tester' is CMake-compatible rule.
-test: $(tester)
-tester: $(tester)
+test: ${tester}
+tester: ${tester}
 
 test/clean:
-	$(RM) $(tester) test/*.o
+	${RM} ${tester} test/*.o
 
 test/check: check
 
@@ -251,13 +303,13 @@ check: tester
 #-------------------------------------------------------------------------------
 # headers
 # precompile headers to verify self-sufficiency
-headers     = $(wildcard include/lapack.hh include/lapack/*.h include/lapack/*.hh test/*.hh)
-headers_gch = $(addsuffix .gch, $(basename $(headers)))
+headers     = ${wildcard include/lapack.hh include/lapack/*.h include/lapack/*.hh test/*.hh}
+headers_gch = ${addsuffix .gch, ${basename ${headers}}}
 
-headers: $(headers_gch)
+headers: ${headers_gch}
 
 headers/clean:
-	$(RM) $(headers_gch)
+	${RM} ${headers_gch}
 
 # sub-directory rules
 include: headers
@@ -267,14 +319,14 @@ include/clean: headers/clean
 #-------------------------------------------------------------------------------
 # pkgconfig
 # Keep -std=c++11 in CXXFLAGS. Keep -fopenmp in LDFLAGS.
-CXXFLAGS_clean = $(filter-out -O% -W% -pedantic -D% -I./include -I$(blaspp_dir)% -MMD -fPIC -fopenmp, $(CXXFLAGS))
-CPPFLAGS_clean = $(filter-out -O% -W% -pedantic -D% -I./include -I$(blaspp_dir)% -MMD -fPIC -fopenmp, $(CPPFLAGS))
-LDFLAGS_clean  = $(filter-out -fPIC, $(LDFLAGS))
+CXXFLAGS_clean = ${filter-out -O% -W% -pedantic -D% -I./include -I${blaspp_dir}% -MMD -fPIC -fopenmp, ${CXXFLAGS}}
+CPPFLAGS_clean = ${filter-out -O% -W% -pedantic -D% -I./include -I${blaspp_dir}% -MMD -fPIC -fopenmp, ${CPPFLAGS}}
+LDFLAGS_clean  = ${filter-out -fPIC, ${LDFLAGS}}
 
-.PHONY: $(pkg)
-$(pkg):
+.PHONY: ${pkg}
+${pkg}:
 	perl -pe "s'#VERSION'2023.11.05'; \
-	          s'#PREFIX'${prefix}'; \
+	          s'#PREFIX'${abs_prefix}'; \
 	          s'#CXX\b'${CXX}'; \
 	          s'#CXXFLAGS'${CXXFLAGS_clean}'; \
 	          s'#CPPFLAGS'${CPPFLAGS_clean}'; \
@@ -293,7 +345,7 @@ doc_files = \
 	README.md \
 	INSTALL.md \
 
-docs/html/index.html: $(headers) $(lib_src) $(tester_src) $(doc_files)
+docs/html/index.html: ${headers} ${lib_src} ${tester_src} ${doc_files}
 	doxygen docs/doxygen/doxyfile.conf
 	@echo ========================================
 	cat docs/doxygen/errors.txt
@@ -308,10 +360,10 @@ test/docs: docs
 #-------------------------------------------------------------------------------
 # general rules
 clean: lib/clean test/clean headers/clean
-	$(RM) $(dep)
+	${RM} ${dep}
 
 distclean: clean
-	$(RM) make.inc include/lapack/defines.h
+	${RM} make.inc include/lapack/defines.h
 
 # Install git hooks
 hooks = .git/hooks/pre-commit
@@ -325,66 +377,73 @@ hooks: ${hooks}
 	fi
 
 %.o: %.cc
-	$(CXX) $(CXXFLAGS) -c $< -o $@
+	${CXX} ${CXXFLAGS} -c $< -o $@
 
 # preprocess source
 %.i: %.cc
-	$(CXX) $(CXXFLAGS) -I$(blaspp_dir)/test -I$(testsweeper_dir) -E $< -o $@
+	${CXX} ${CXXFLAGS} -I${blaspp_dir}/test -I${testsweeper_dir} -E $< -o $@
 
 # preprocess source
 %.i: %.h
-	$(CXX) $(CXXFLAGS) -I$(blaspp_dir)/test -I$(testsweeper_dir) -E $< -o $@
+	${CXX} ${CXXFLAGS} -I${blaspp_dir}/test -I${testsweeper_dir} -E $< -o $@
 
 # preprocess source
 %.i: %.hh
-	$(CXX) $(CXXFLAGS) -I$(blaspp_dir)/test -I$(testsweeper_dir) -E $< -o $@
+	${CXX} ${CXXFLAGS} -I${blaspp_dir}/test -I${testsweeper_dir} -E $< -o $@
 
 # precompile header to check for errors
 %.gch: %.h
-	$(CXX) $(CXXFLAGS) -I$(blaspp_dir)/test -I$(testsweeper_dir) -c $< -o $@
+	${CXX} ${CXXFLAGS} -I${blaspp_dir}/test -I${testsweeper_dir} -c $< -o $@
 
 %.gch: %.hh
-	$(CXX) $(CXXFLAGS) -I$(blaspp_dir)/test -I$(testsweeper_dir) -c $< -o $@
+	${CXX} ${CXXFLAGS} -I${blaspp_dir}/test -I${testsweeper_dir} -c $< -o $@
 
--include $(dep)
+-include ${dep}
 
 #-------------------------------------------------------------------------------
 # debugging
 echo:
-	@echo "static        = '$(static)'"
-	@echo "id            = '$(id)'"
-	@echo "last_id       = '$(last_id)'"
+	@echo "ostype        = '${ostype}'"
+	@echo "static        = '${static}'"
+	@echo "id            = '${id}'"
+	@echo "last_id       = '${last_id}'"
+	@echo "abi_version   = '${abi_version}'"
+	@echo "soversion     = '${soversion}'"
 	@echo
-	@echo "lib_a         = $(lib_a)"
-	@echo "lib_so        = $(lib_so)"
-	@echo "lib           = $(lib)"
+	@echo "lib_name      = ${lib_name}"
+	@echo "lib_a         = ${lib_a}"
+	@echo "lib_so        = ${lib_so}"
+	@echo "lib           = ${lib}"
+	@echo "lib_so_abi    = ${lib_so_abi}"
+	@echo "lib_soname    = ${lib_soname}"
 	@echo
-	@echo "lib_src       = $(lib_src)"
+	@echo "lib_src       = ${lib_src}"
 	@echo
-	@echo "lib_obj       = $(lib_obj)"
+	@echo "lib_obj       = ${lib_obj}"
 	@echo
-	@echo "tester_src    = $(tester_src)"
+	@echo "tester_src    = ${tester_src}"
 	@echo
-	@echo "tester_obj    = $(tester_obj)"
+	@echo "tester_obj    = ${tester_obj}"
 	@echo
-	@echo "tester        = $(tester)"
+	@echo "tester        = ${tester}"
 	@echo
-	@echo "dep           = $(dep)"
+	@echo "dep           = ${dep}"
 	@echo
-	@echo "testsweeper_dir   = $(testsweeper_dir)"
-	@echo "testsweeper_src   = $(testsweeper_src)"
-	@echo "testsweeper       = $(testsweeper)"
+	@echo "testsweeper_dir   = ${testsweeper_dir}"
+	@echo "testsweeper_src   = ${testsweeper_src}"
+	@echo "testsweeper       = ${testsweeper}"
 	@echo
-	@echo "blaspp_dir    = $(blaspp_dir)"
-	@echo "blaspp_src    = $(blaspp_src)"
-	@echo "libblaspp     = $(libblaspp)"
+	@echo "blaspp_dir    = ${blaspp_dir}"
+	@echo "blaspp_src    = ${blaspp_src}"
+	@echo "blaspp        = ${blaspp}"
 	@echo
-	@echo "CXX           = $(CXX)"
-	@echo "CXXFLAGS      = $(CXXFLAGS)"
+	@echo "CXX           = ${CXX}"
+	@echo "CXXFLAGS      = ${CXXFLAGS}"
 	@echo
-	@echo "LD            = $(LD)"
-	@echo "LDFLAGS       = $(LDFLAGS)"
-	@echo "LIBS          = $(LIBS)"
+	@echo "LD            = ${LD}"
+	@echo "LDFLAGS       = ${LDFLAGS}"
+	@echo "LIBS          = ${LIBS}"
+	@echo "ldflags_shared = ${ldflags_shared}"
 	@echo
-	@echo "TEST_LDFLAGS  = $(TEST_LDFLAGS)"
-	@echo "TEST_LIBS     = $(TEST_LIBS)"
+	@echo "TEST_LDFLAGS  = ${TEST_LDFLAGS}"
+	@echo "TEST_LIBS     = ${TEST_LIBS}"
diff --git a/include/lapack/device.hh b/include/lapack/device.hh
index c313eae5..14f480c3 100644
--- a/include/lapack/device.hh
+++ b/include/lapack/device.hh
@@ -58,22 +58,6 @@ public:
         #endif
     {}
 
-    // Pragmas so g++ ignores use of blas::Queue's deprecated constructor
-    // in lapack::Queue's deprecated constructor. clang already ignores it.
-    #pragma GCC diagnostic push
-    #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-    [[deprecated("use Queue( device ). Batch chunk size is handled automatically. To be removed 2024-05.")]]
-    Queue( int device, int64_t batch_chunk )
-      : blas::Queue( device, batch_chunk )
-        #if defined(LAPACK_HAVE_CUBLAS)
-            , solver_( nullptr )
-            #if CUSOLVER_VERSION >= 11000
-                , solver_params_( nullptr )
-            #endif
-        #endif
-    {}
-    #pragma GCC diagnostic pop
-
     ~Queue()
     {
         #if defined(LAPACK_HAVE_CUBLAS)