diff --git a/Formula/t/tectonic.rb b/Formula/t/tectonic.rb
index 539bfba7f298..a384b5791dcd 100644
--- a/Formula/t/tectonic.rb
+++ b/Formula/t/tectonic.rb
@@ -38,8 +38,11 @@ class Tectonic < Formula
 
   def install
     ENV.cxx11
-    ENV["MACOSX_DEPLOYMENT_TARGET"] = MacOS.version.to_s # needed for CLT-only builds
-    ENV.delete("HOMEBREW_SDKROOT") if MacOS.version == :high_sierra
+
+    if OS.mac?
+      ENV["MACOSX_DEPLOYMENT_TARGET"] = MacOS.version.to_s # needed for CLT-only builds
+      ENV.delete("HOMEBREW_SDKROOT") if MacOS.version == :high_sierra
+    end
 
     # Ensure that the `openssl` crate picks up the intended library.
     # https://crates.io/crates/openssl#manual-configuration
diff --git a/Formula/t/tmux.rb b/Formula/t/tmux.rb
index feeb8df2246b..ce2ba4323546 100644
--- a/Formula/t/tmux.rb
+++ b/Formula/t/tmux.rb
@@ -68,12 +68,16 @@ def install
       --sysconfdir=#{etc}
     ]
 
-    # tmux finds the `tmux-256color` terminfo provided by our ncurses
-    # and uses that as the default `TERM`, but this causes issues for
-    # tools that link with the very old ncurses provided by macOS.
-    # https://github.com/Homebrew/homebrew-core/issues/102748
-    args << "--with-TERM=screen-256color" if OS.mac?
-    args << "--enable-utf8proc" if MacOS.version >= :high_sierra || OS.linux?
+    if OS.mac?
+      # tmux finds the `tmux-256color` terminfo provided by our ncurses
+      # and uses that as the default `TERM`, but this causes issues for
+      # tools that link with the very old ncurses provided by macOS.
+      # https://github.com/Homebrew/homebrew-core/issues/102748
+      args << "--with-TERM=screen-256color"
+      args << "--enable-utf8proc" if MacOS.version >= :high_sierra
+    else
+      args << "--enable-utf8proc"
+    end
 
     ENV.append "LDFLAGS", "-lresolv"
     system "./configure", *args
diff --git a/Formula/t/trafficserver.rb b/Formula/t/trafficserver.rb
index d6e3e886436f..03c002512fbe 100644
--- a/Formula/t/trafficserver.rb
+++ b/Formula/t/trafficserver.rb
@@ -49,7 +49,7 @@ class Trafficserver < Formula
   def install
     # Per https://luajit.org/install.html: If MACOSX_DEPLOYMENT_TARGET
     # is not set then it's forced to 10.4, which breaks compile on Mojave.
-    ENV["MACOSX_DEPLOYMENT_TARGET"] = MacOS.version.to_s
+    ENV["MACOSX_DEPLOYMENT_TARGET"] = MacOS.version.to_s if OS.mac?
 
     args = %W[
       --prefix=#{prefix}
diff --git a/Formula/t/travis.rb b/Formula/t/travis.rb
index 5da38c5679cf..583663cb385b 100644
--- a/Formula/t/travis.rb
+++ b/Formula/t/travis.rb
@@ -184,7 +184,7 @@ class Travis < Formula
   def install
     ENV["GEM_HOME"] = libexec
     # gem issue on Mojave
-    ENV["SDKROOT"] = MacOS.sdk_path if MacOS.version == :mojave
+    ENV["SDKROOT"] = MacOS.sdk_path if OS.mac? && MacOS.version == :mojave
 
     resources.each do |r|
       r.fetch
diff --git a/Formula/t/tta.rb b/Formula/t/tta.rb
index 94db75ab5a14..96b5712bfa82 100644
--- a/Formula/t/tta.rb
+++ b/Formula/t/tta.rb
@@ -29,7 +29,14 @@ class Tta < Formula
 
   def install
     args = ["--disable-silent-rules"]
-    args << "--enable-#{MacOS.version.requires_sse4? ? "sse4" : "sse2"}" if Hardware::CPU.intel?
+    if Hardware::CPU.intel?
+      sse = if OS.mac? && MacOS.version.requires_sse4?
+        "sse4"
+      else
+        "sse2"
+      end
+      args << "--enable-#{sse}"
+    end
 
     system "./configure", *std_configure_args, *args
     system "make", "install"
diff --git a/Formula/v/v8@3.15.rb b/Formula/v/v8@3.15.rb
index 35fea8aca087..5dfc192d4cb2 100644
--- a/Formula/v/v8@3.15.rb
+++ b/Formula/v/v8@3.15.rb
@@ -28,7 +28,8 @@ class V8AT315 < Formula
   def install
     # Bully GYP into correctly linking with c++11
     ENV.cxx11
-    ENV["GYP_DEFINES"] = "clang=1 mac_deployment_target=#{MacOS.version}"
+    ENV["GYP_DEFINES"] = "clang=1 mac_deployment_target=#{MacOS.version}" if OS.mac?
+
     (buildpath/"build/gyp").install resource("gyp")
 
     # fix up libv8.dylib install_name
diff --git a/Formula/v/vorbis-tools.rb b/Formula/v/vorbis-tools.rb
index da08d8664f5d..4fce54eaa1b4 100644
--- a/Formula/v/vorbis-tools.rb
+++ b/Formula/v/vorbis-tools.rb
@@ -47,15 +47,15 @@ class VorbisTools < Formula
   end
 
   def install
-    # Prevent linkage with Homebrew Curl on macOS because of `using: :homebrew_curl` above.
     if OS.mac?
+      # Prevent linkage with Homebrew Curl on macOS because of `using: :homebrew_curl` above.
       ENV.remove "HOMEBREW_DEPENDENCIES", "curl"
       ENV.remove "HOMEBREW_INCLUDE_PATHS", Formula["curl"].opt_include
       ENV.remove "HOMEBREW_LIBRARY_PATHS", Formula["curl"].opt_lib
-    end
 
-    # Workaround for Xcode 14 ld.
-    system "autoreconf", "--force", "--install", "--verbose" if MacOS.version >= :monterey
+      # Workaround for Xcode 14 ld.
+      system "autoreconf", "--force", "--install", "--verbose" if MacOS.version >= :monterey
+    end
 
     # Fix compile with newer Clang
     ENV.append_to_cflags "-Wno-implicit-function-declaration" if DevelopmentTools.clang_build_version >= 1403
diff --git a/Formula/v/vrpn.rb b/Formula/v/vrpn.rb
index 4adeaac0dc22..76b9b6482bf3 100644
--- a/Formula/v/vrpn.rb
+++ b/Formula/v/vrpn.rb
@@ -24,10 +24,13 @@ class Vrpn < Formula
 
   def install
     mkdir "build" do
-      system "cmake", "..", *std_cmake_args,
-                            "-DCMAKE_OSX_SYSROOT=#{MacOS.sdk_path}",
-                            "-DVRPN_BUILD_CLIENTS:BOOL=OFF",
-                            "-DVRPN_BUILD_JAVA:BOOL=OFF"
+      cmake_args = [
+        "-DVRPN_BUILD_CLIENTS:BOOL=OFF",
+        "-DVRPN_BUILD_JAVA:BOOL=OFF",
+      ]
+      cmake_args << "-DCMAKE_OSX_SYSROOT=#{MacOS.sdk_path}" if OS.mac?
+
+      system "cmake", "..", *std_cmake_args, *cmake_args
       system "make", "install"
     end
   end
diff --git a/Formula/w/wrk.rb b/Formula/w/wrk.rb
index 874f612d14d4..697ed4a5b31f 100644
--- a/Formula/w/wrk.rb
+++ b/Formula/w/wrk.rb
@@ -34,7 +34,7 @@ class Wrk < Formula
 
   def install
     ENV.deparallelize
-    ENV["MACOSX_DEPLOYMENT_TARGET"] = MacOS.version.to_s
+    ENV["MACOSX_DEPLOYMENT_TARGET"] = MacOS.version.to_s if OS.mac?
     ENV.append_to_cflags "-I#{Formula["luajit"].opt_include}/luajit-2.1"
     args = %W[
       WITH_LUAJIT=#{Formula["luajit"].opt_prefix}
diff --git a/Formula/y/yaws.rb b/Formula/y/yaws.rb
index a4f36914b2bf..2192a97f6bfa 100644
--- a/Formula/y/yaws.rb
+++ b/Formula/y/yaws.rb
@@ -40,12 +40,13 @@ class Yaws < Formula
   skip_clean "lib/yaws/examples/include"
 
   def install
-    # Ensure pam headers are found on Xcode-only installs
-    extra_args = %W[
-      --with-extrainclude=#{MacOS.sdk_path}/usr/include/security
-    ]
-    if OS.linux?
-      extra_args = %W[
+    extra_args = if OS.mac?
+      # Ensure pam headers are found on Xcode-only installs
+      %W[
+        --with-extrainclude=#{MacOS.sdk_path}/usr/include/security
+      ]
+    else
+      %W[
         --with-extrainclude=#{Formula["linux-pam"].opt_include}/security
       ]
     end
diff --git a/Formula/z/zeromq.rb b/Formula/z/zeromq.rb
index 2dd393cf17bd..7235410c7086 100644
--- a/Formula/z/zeromq.rb
+++ b/Formula/z/zeromq.rb
@@ -37,7 +37,7 @@ class Zeromq < Formula
 
   def install
     # Work around "error: no member named 'signbit' in the global namespace"
-    if MacOS.version == :high_sierra
+    if OS.mac? && MacOS.version == :high_sierra
       ENV.delete("HOMEBREW_SDKROOT")
       ENV.delete("SDKROOT")
     end