build: Allow building with PySide6 with the USE_PYSIDE6 environment v…

…ariable

Issue the command e.g. USE_PYSIDE=6 make install to skip the PyQt prereq folder
and install PySide6 (commented out in app_requirements.txt) instead.

prereqs/Makefile

@@ -56,8 +56,12 @@ endif
 .NOTPARALLEL:
 
 # keep in alphabetical order, dependencies go below
-SUBDIRS	+= ambertools pips PyQt Python
 
+SUBDIRS	+= ambertools pips
+ifndef USE_PYSIDE6
+SUBDIRS += PyQt
+endif
+SUBDIRS += Python
 
 # All needed subdirectories must be set by now.
 include $(TOP)/mk/subdir.make

prereqs/pips/Makefile

@@ -70,6 +70,10 @@ app-install: $(PLATO_WHEELS)
 	# Install numpy first so that PyOpenGL_Accelerate will compile numpy_formathandler
 	$(APP_PIP_INSTALL) $(shell grep numpy app_requirements.txt)
 	CFLAGS+=$(WHEEL_CFLAGS) $(APP_PIP_INSTALL) --no-build-isolation -r app_requirements.txt
+ifdef USE_PYSIDE6
+	$(APP_PIP_INSTALL) $(shell grep PySide6 app_requirements.txt | sed -e 's/#//')
+	$(APP_PIP_INSTALL) $(shell grep shiboken6 app_requirements.txt | sed -e 's/#//')
+endif
 ifneq (,$(SOURCE_WHEELS))
 	LANG=$(LANG) $(PIP_INSTALL) --no-build-isolation --no-binary $(subst $(SPACE),$(COMMA),$(SOURCE_WHEELS)) $(SOURCE_VERSIONS)
 endif

prereqs/pips/app_requirements.txt

@@ -51,7 +51,8 @@ PyOpenGL-accelerate==3.1.7
 python-dateutil==2.9.0.post0
 # PyQt handled in prereqs/PyQt
 # sip handled in prereqs/PyQt
-#PySide2==5.15.2
+#PySide6==6.8.1.1
+#shiboken6==6.8.1.1
 qtconsole==5.5.2
 requests==2.32.3
 scipy==1.14.0