diff --git a/pkgs/by-name/hy/hyperscan/package.nix b/pkgs/by-name/hy/hyperscan/package.nix
index b9ba8e7b8dda..bce1ead253fd 100644
--- a/pkgs/by-name/hy/hyperscan/package.nix
+++ b/pkgs/by-name/hy/hyperscan/package.nix
@@ -56,8 +56,8 @@ stdenv.mkDerivation (finalAttrs: {
   postPatch = ''
     sed -i '/examples/d' CMakeLists.txt
     substituteInPlace libhs.pc.in \
-      --replace "libdir=@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_LIBDIR@" "libdir=@CMAKE_INSTALL_LIBDIR@" \
-      --replace "includedir=@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_INCLUDEDIR@" "includedir=@CMAKE_INSTALL_INCLUDEDIR@"
+      --replace-fail "libdir=@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_LIBDIR@" "libdir=@CMAKE_INSTALL_LIBDIR@" \
+      --replace-fail "includedir=@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_INCLUDEDIR@" "includedir=@CMAKE_INSTALL_INCLUDEDIR@"
   '';
 
   doCheck = true;
diff --git a/pkgs/by-name/ve/vectorscan/package.nix b/pkgs/by-name/ve/vectorscan/package.nix
index 7ac93806d006..e2554d526f25 100644
--- a/pkgs/by-name/ve/vectorscan/package.nix
+++ b/pkgs/by-name/ve/vectorscan/package.nix
@@ -24,6 +24,10 @@ stdenv.mkDerivation rec {
   };
 
   postPatch = ''
+    sed -i '/examples/d' CMakeLists.txt
+    substituteInPlace libhs.pc.in \
+      --replace-fail "libdir=@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_LIBDIR@" "libdir=@CMAKE_INSTALL_LIBDIR@" \
+      --replace-fail "includedir=@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_INCLUDEDIR@" "includedir=@CMAKE_INSTALL_INCLUDEDIR@"
     substituteInPlace cmake/build_wrapper.sh \
       --replace-fail 'nm' '${stdenv.cc.targetPrefix}nm' \
       --replace-fail 'objcopy' '${stdenv.cc.targetPrefix}objcopy'