diff --git a/Formula/s/sh4d0wup.rb b/Formula/s/sh4d0wup.rb
index 6b2b04896549..7992180aa0da 100644
--- a/Formula/s/sh4d0wup.rb
+++ b/Formula/s/sh4d0wup.rb
@@ -15,7 +15,7 @@ class Sh4d0wup < Formula
   end
 
   depends_on "llvm" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "rust" => :build
   depends_on "pgpdump" => :test
 
diff --git a/Formula/s/shairport-sync.rb b/Formula/s/shairport-sync.rb
index 2dfb05aa8165..2d9815f3da87 100644
--- a/Formula/s/shairport-sync.rb
+++ b/Formula/s/shairport-sync.rb
@@ -24,7 +24,7 @@ class ShairportSync < Formula
 
   depends_on "autoconf" => :build
   depends_on "automake" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "libao"
   depends_on "libconfig"
   depends_on "libdaemon"
@@ -34,7 +34,7 @@ class ShairportSync < Formula
   depends_on "pulseaudio"
 
   def install
-    system "autoreconf", "-fvi"
+    system "autoreconf", "--force", "--install", "--verbose"
     args = %W[
       --with-libdaemon
       --with-ssl=openssl
diff --git a/Formula/s/shared-mime-info.rb b/Formula/s/shared-mime-info.rb
index 3cecb0c21cd5..d3e28dc4c0ed 100644
--- a/Formula/s/shared-mime-info.rb
+++ b/Formula/s/shared-mime-info.rb
@@ -27,7 +27,7 @@ class SharedMimeInfo < Formula
   depends_on "itstool" => :build
   depends_on "meson" => :build
   depends_on "ninja" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "xmlto" => :build
   depends_on "glib"
 
diff --git a/Formula/s/shibboleth-sp.rb b/Formula/s/shibboleth-sp.rb
index bf428da16935..9356cb4ad5c8 100644
--- a/Formula/s/shibboleth-sp.rb
+++ b/Formula/s/shibboleth-sp.rb
@@ -19,7 +19,7 @@ class ShibbolethSp < Formula
     sha256 x86_64_linux:  "0dd53cb012bdb80804df6c2ae04476966cc9f337b4e5b2df5ee5cdef9017191c"
   end
 
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
 
   depends_on "apr"
   depends_on "apr-util"
diff --git a/Formula/s/sigrok-cli.rb b/Formula/s/sigrok-cli.rb
index 8b0d5ed83f97..d17f1e317c86 100644
--- a/Formula/s/sigrok-cli.rb
+++ b/Formula/s/sigrok-cli.rb
@@ -32,7 +32,7 @@ class SigrokCli < Formula
     depends_on "libtool" => :build
   end
 
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "glib"
   depends_on "libsigrok"
   depends_on "libsigrokdecode"
diff --git a/Formula/s/sile.rb b/Formula/s/sile.rb
index 52f3ddb25dd0..b9164f4c02c9 100644
--- a/Formula/s/sile.rb
+++ b/Formula/s/sile.rb
@@ -24,7 +24,7 @@ class Sile < Formula
   end
 
   depends_on "jq" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "poppler" => :build
   depends_on "rust" => :build
 
diff --git a/Formula/s/silicon.rb b/Formula/s/silicon.rb
index 5eef8dd6622e..eb034744c740 100644
--- a/Formula/s/silicon.rb
+++ b/Formula/s/silicon.rb
@@ -20,7 +20,7 @@ class Silicon < Formula
   depends_on "harfbuzz"
 
   on_linux do
-    depends_on "pkg-config" => :build
+    depends_on "pkgconf" => :build
     depends_on "libxcb"
     depends_on "xclip"
   end
@@ -30,7 +30,7 @@ def install
   end
 
   test do
-    (testpath/"test.rs").write <<~EOF
+    (testpath/"test.rs").write <<~RUST
       fn factorial(n: u64) -> u64 {
           match n {
               0 => 1,
@@ -41,10 +41,10 @@ def install
       fn main() {
           println!("10! = {}", factorial(10));
       }
-    EOF
+    RUST
 
     system bin/"silicon", "-o", "output.png", "test.rs"
-    assert_predicate testpath/"output.png", :exist?
+    assert_path_exists testpath/"output.png"
     expected_size = [894, 630]
     assert_equal expected_size, File.read("output.png")[0x10..0x18].unpack("NN")
   end
diff --git a/Formula/s/silk.rb b/Formula/s/silk.rb
index e8dc4044a478..7a3d56a0fa70 100644
--- a/Formula/s/silk.rb
+++ b/Formula/s/silk.rb
@@ -19,7 +19,7 @@ class Silk < Formula
     sha256 x86_64_linux:  "41438d609da5625f2a222397a1e8e5e85c82d2fe5aed69192e5b82394f52ebc0"
   end
 
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
 
   depends_on "glib"
   depends_on "libfixbuf"
diff --git a/Formula/s/simple-mtpfs.rb b/Formula/s/simple-mtpfs.rb
index d963c160e997..90c02f5459bc 100644
--- a/Formula/s/simple-mtpfs.rb
+++ b/Formula/s/simple-mtpfs.rb
@@ -13,7 +13,7 @@ class SimpleMtpfs < Formula
   depends_on "autoconf" => :build
   depends_on "autoconf-archive" => :build # required for AX_CXX_COMPILE_STDCXX_17
   depends_on "automake" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "libfuse@2"
   depends_on "libmtp"
   depends_on "libusb"
diff --git a/Formula/s/simple-scan.rb b/Formula/s/simple-scan.rb
index 6f2c39da3cf7..5183125efcfe 100644
--- a/Formula/s/simple-scan.rb
+++ b/Formula/s/simple-scan.rb
@@ -20,7 +20,7 @@ class SimpleScan < Formula
   depends_on "itstool" => :build
   depends_on "meson" => :build
   depends_on "ninja" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "vala" => :build
 
   depends_on "cairo"
diff --git a/Formula/s/simple-tiles.rb b/Formula/s/simple-tiles.rb
index cc6d0b8040e9..0c02319d76a7 100644
--- a/Formula/s/simple-tiles.rb
+++ b/Formula/s/simple-tiles.rb
@@ -16,7 +16,7 @@ class SimpleTiles < Formula
     sha256 cellar: :any_skip_relocation, x86_64_linux:  "5b9bddf6bb8104fa5720df1b5a14e1f15710a09f04ccd9901555cc61bfd9d568"
   end
 
-  depends_on "pkg-config" => [:build, :test]
+  depends_on "pkgconf" => [:build, :test]
 
   depends_on "cairo"
   depends_on "gdal"
@@ -59,7 +59,7 @@ def install
         return 0;
       }
     C
-    cflags = shell_output("pkg-config --cflags simple-tiles").chomp.split
+    cflags = shell_output("pkgconf --cflags simple-tiles").chomp.split
     system ENV.cc, "test.c", *cflags, "-L#{lib}", "-lsimple-tiles", "-o", "test"
     system "./test"
   end
diff --git a/Formula/s/simutrans.rb b/Formula/s/simutrans.rb
index df2ae27f4b98..0a09f5046017 100644
--- a/Formula/s/simutrans.rb
+++ b/Formula/s/simutrans.rb
@@ -27,7 +27,7 @@ class Simutrans < Formula
   end
 
   depends_on "cmake" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "fluid-synth"
   depends_on "fontconfig"
   depends_on "freetype"
@@ -41,8 +41,6 @@ class Simutrans < Formula
   uses_from_macos "curl"
   uses_from_macos "zlib"
 
-  fails_with gcc: "5"
-
   resource "pak64" do
     url "https://downloads.sourceforge.net/project/simutrans/pak64/124-2/simupak64-124-2.zip"
     sha256 "e690e4647a1a617032a3778a2457c8812cc4510afad0f5bf8524999468146d86"
@@ -56,7 +54,7 @@ def install
     # These translations are dynamically generated.
     system "./tools/get_lang_files.sh"
 
-    system "cmake", "-B", "build", "-S", ".", *std_cmake_args, "-DSIMUTRANS_USE_REVISION=#{stable.specs[:revision]}"
+    system "cmake", "-B", "build", "-S", ".", "-DSIMUTRANS_USE_REVISION=#{stable.specs[:revision]}", *std_cmake_args
     system "cmake", "--build", "build"
     system "cmake", "--build", "build", "--target", "makeobj"
     system "cmake", "--build", "build", "--target", "nettool"
diff --git a/Formula/s/siril.rb b/Formula/s/siril.rb
index fd2241ea99af..d46aa63f5412 100644
--- a/Formula/s/siril.rb
+++ b/Formula/s/siril.rb
@@ -19,7 +19,7 @@ class Siril < Formula
   depends_on "cmake" => :build
   depends_on "meson" => :build
   depends_on "ninja" => :build
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
 
   depends_on "adwaita-icon-theme"
   depends_on "cairo"
@@ -55,8 +55,6 @@ class Siril < Formula
     depends_on "libomp"
   end
 
-  fails_with gcc: "5" # ffmpeg is compiled with GCC
-
   def install
     args = %w[
       --force-fallback-for=kplot
diff --git a/Formula/s/sispmctl.rb b/Formula/s/sispmctl.rb
index b6cfadc1f0be..e6884ad44743 100644
--- a/Formula/s/sispmctl.rb
+++ b/Formula/s/sispmctl.rb
@@ -16,12 +16,11 @@ class Sispmctl < Formula
     sha256 x86_64_linux:   "db43f15862bbace1e2af6f17b257da7d3522011d82f00fa581d78fea1faa47db"
   end
 
-  depends_on "pkg-config" => :build
+  depends_on "pkgconf" => :build
   depends_on "libusb-compat"
 
   def install
-    system "./configure", "--disable-dependency-tracking",
-                          "--prefix=#{prefix}"
+    system "./configure", *std_configure_args
     system "make", "install"
   end