diff --git a/Formula/h/h2o.rb b/Formula/h/h2o.rb
index 4b6476eb7d5a2..fd8dc527c7ca3 100644
--- a/Formula/h/h2o.rb
+++ b/Formula/h/h2o.rb
@@ -20,7 +20,7 @@ class H2o < Formula
   end
 
   depends_on "cmake" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "openssl@3"
 
   uses_from_macos "zlib"
@@ -81,11 +81,8 @@ def caveats
   test do
     port = free_port
     (testpath/"h2o.conf").write conf_example(port)
-    fork do
-      exec "#{bin}/h2o -c #{testpath}/h2o.conf"
-    end
+    spawn "#{bin}/h2o -c #{testpath}/h2o.conf"
     sleep 2
-
     assert_match "Welcome to H2O", shell_output("curl localhost:#{port}")
   end
 end
diff --git a/Formula/h/hackrf.rb b/Formula/h/hackrf.rb
index 60492cf33a877..4235ac38bfce9 100644
--- a/Formula/h/hackrf.rb
+++ b/Formula/h/hackrf.rb
@@ -23,22 +23,16 @@ class Hackrf < Formula
   end
 
   depends_on "cmake" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "fftw"
   depends_on "libusb"
 
   def install
-    cd "host" do
-      args = std_cmake_args
+    args = OS.linux? ? ["-DUDEV_RULES_GROUP=plugdev", "-DUDEV_RULES_PATH=#{lib}/udev/rules.d"] : []
 
-      if OS.linux?
-        args << "-DUDEV_RULES_GROUP=plugdev"
-        args << "-DUDEV_RULES_PATH=#{lib}/udev/rules.d"
-      end
-
-      system "cmake", ".", *args
-      system "make", "install"
-    end
+    system "cmake", "-S", "host", "-B", "build", *args, *std_cmake_args
+    system "cmake", "--build", "build"
+    system "cmake", "--install", "build"
     pkgshare.install "firmware-bin/"
   end
 
diff --git a/Formula/h/hamlib.rb b/Formula/h/hamlib.rb
index bd87f0e56dfa5..613d576f27d17 100644
--- a/Formula/h/hamlib.rb
+++ b/Formula/h/hamlib.rb
@@ -21,7 +21,7 @@ class Hamlib < Formula
 
   depends_on "autoconf" => :build
   depends_on "automake" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "libtool"
   depends_on "libusb"
   depends_on "libusb-compat"
@@ -30,8 +30,6 @@ class Hamlib < Formula
     depends_on "readline"
   end
 
-  fails_with gcc: "5"
-
   def install
     system "./bootstrap" if build.head?
     system "./configure", "--disable-silent-rules", *std_configure_args
diff --git a/Formula/h/handbrake.rb b/Formula/h/handbrake.rb
index 0c41d49265ae0..a70acd6d717f8 100644
--- a/Formula/h/handbrake.rb
+++ b/Formula/h/handbrake.rb
@@ -23,7 +23,7 @@ class Handbrake < Formula
   depends_on "meson" => :build
   depends_on "nasm" => :build
   depends_on "ninja" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "yasm" => :build
 
   uses_from_macos "m4" => :build
diff --git a/Formula/h/harfbuzz.rb b/Formula/h/harfbuzz.rb
index 2ec34fa8d5dca..9063bdce8997d 100644
--- a/Formula/h/harfbuzz.rb
+++ b/Formula/h/harfbuzz.rb
@@ -18,7 +18,7 @@ class Harfbuzz < Formula
   depends_on "gobject-introspection" => :build
   depends_on "meson" => :build
   depends_on "ninja" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "python@3.13" => [:build, :test]
   depends_on "pygobject3" => :test
   depends_on "cairo"
@@ -46,7 +46,7 @@ def install
       -Dtests=disabled
     ]
 
-    system "meson", "setup", "build", *std_meson_args, *args
+    system "meson", "setup", "build", *args, *std_meson_args
     system "meson", "compile", "-C", "build", "--verbose"
     system "meson", "install", "-C", "build"
   end
diff --git a/Formula/h/haxe.rb b/Formula/h/haxe.rb
index 28bf2f8e028cc..d0fa5b3e3a4d6 100644
--- a/Formula/h/haxe.rb
+++ b/Formula/h/haxe.rb
@@ -38,7 +38,7 @@ class Haxe < Formula
   depends_on "cmake" => :build
   depends_on "ocaml" => :build
   depends_on "opam" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "mbedtls"
   depends_on "neko"
   depends_on "pcre2"
diff --git a/Formula/h/hcxtools.rb b/Formula/h/hcxtools.rb
index 37294dd801822..30afc01326f78 100644
--- a/Formula/h/hcxtools.rb
+++ b/Formula/h/hcxtools.rb
@@ -15,7 +15,7 @@ class Hcxtools < Formula
     sha256 cellar: :any_skip_relocation, x86_64_linux:  "cfa435ef982fe30b6e3ea26c1d736882a4799c0ee035bccb5cf20bdca00740dd"
   end
 
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "openssl@3"
 
   uses_from_macos "curl"
diff --git a/Formula/h/hdf5-mpi.rb b/Formula/h/hdf5-mpi.rb
index 96da06b193f03..44dfb76515a01 100644
--- a/Formula/h/hdf5-mpi.rb
+++ b/Formula/h/hdf5-mpi.rb
@@ -23,7 +23,7 @@ class Hdf5Mpi < Formula
   depends_on "gcc" # for gfortran
   depends_on "libaec"
   depends_on "open-mpi"
-  depends_on "pkg-config"
+  depends_on "pkgconf"
 
   uses_from_macos "zlib"
 
diff --git a/Formula/h/hdf5.rb b/Formula/h/hdf5.rb
index aa25df3f2ef01..30d56c10cbb8e 100644
--- a/Formula/h/hdf5.rb
+++ b/Formula/h/hdf5.rb
@@ -26,7 +26,7 @@ class Hdf5 < Formula
   depends_on "cmake" => :build
   depends_on "gcc" # for gfortran
   depends_on "libaec"
-  depends_on "pkg-config"
+  depends_on "pkgconf"
 
   uses_from_macos "zlib"
 
diff --git a/Formula/h/hdt.rb b/Formula/h/hdt.rb
index 5dce303b5a804..c0e32dc7ddce7 100644
--- a/Formula/h/hdt.rb
+++ b/Formula/h/hdt.rb
@@ -24,7 +24,7 @@ class Hdt < Formula
   depends_on "autoconf" => :build
   depends_on "automake" => :build
   depends_on "libtool" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "serd"
 
   uses_from_macos "zlib"
@@ -55,7 +55,7 @@ def install
     EOS
 
     system bin/"rdf2hdt", test_file, "test.hdt"
-    assert_predicate testpath/"test.hdt", :exist?
+    assert_path_exists testpath/"test.hdt"
     system bin/"hdtInfo", "test.hdt"
   end
 end
diff --git a/Formula/h/healpix.rb b/Formula/h/healpix.rb
index 56b1a4087bcc3..1aeb15d95a2f8 100644
--- a/Formula/h/healpix.rb
+++ b/Formula/h/healpix.rb
@@ -18,7 +18,7 @@ class Healpix < Formula
   depends_on "autoconf" => :build
   depends_on "automake" => :build
   depends_on "libtool" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "cfitsio"
 
   def install
diff --git a/Formula/h/heimdal.rb b/Formula/h/heimdal.rb
index 46c2ce3fd26cb..2fe861cf371ff 100644
--- a/Formula/h/heimdal.rb
+++ b/Formula/h/heimdal.rb
@@ -38,7 +38,7 @@ class Heimdal < Formula
   uses_from_macos "libxcrypt"
 
   on_linux do
-    depends_on "pkg-config" => :build
+    depends_on "pkgconf" => :build
   end
 
   resource "JSON" do
diff --git a/Formula/h/hfstospell.rb b/Formula/h/hfstospell.rb
index a04bec04c5ccd..117ee705330fe 100644
--- a/Formula/h/hfstospell.rb
+++ b/Formula/h/hfstospell.rb
@@ -23,7 +23,7 @@ class Hfstospell < Formula
   depends_on "autoconf" => :build
   depends_on "automake" => :build
   depends_on "libtool" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "icu4c@76"
   depends_on "libarchive"
 
diff --git a/Formula/h/hidapi.rb b/Formula/h/hidapi.rb
index deebc6f661b2c..c932cf7a1f430 100644
--- a/Formula/h/hidapi.rb
+++ b/Formula/h/hidapi.rb
@@ -20,7 +20,7 @@ class Hidapi < Formula
   end
 
   depends_on "cmake" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
 
   on_linux do
     depends_on "libusb"
diff --git a/Formula/h/highlight.rb b/Formula/h/highlight.rb
index 85c3d078164ab..764d1ff2051c2 100644
--- a/Formula/h/highlight.rb
+++ b/Formula/h/highlight.rb
@@ -21,11 +21,9 @@ class Highlight < Formula
   end
 
   depends_on "boost" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "lua"
 
-  fails_with gcc: "5" # needs C++17
-
   def install
     conf_dir = etc/"highlight/" # highlight needs a final / for conf_dir
     system "make", "PREFIX=#{prefix}", "conf_dir=#{conf_dir}"
diff --git a/Formula/h/highs.rb b/Formula/h/highs.rb
index 10f6c8368a993..424b86f9846c5 100644
--- a/Formula/h/highs.rb
+++ b/Formula/h/highs.rb
@@ -23,14 +23,14 @@ class Highs < Formula
   end
 
   depends_on "cmake" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
 
   uses_from_macos "zlib"
 
   def install
     system "cmake", "-S", ".", "-B", "build",
-                    *std_cmake_args,
-                    "-DCMAKE_INSTALL_RPATH=#{rpath}"
+                    "-DCMAKE_INSTALL_RPATH=#{rpath}",
+                    *std_cmake_args
     system "cmake", "--build", "build"
     system "cmake", "--install", "build"
     pkgshare.install "check", "examples"