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-rw-r--r--pkgs/tools/filesystems/moosefs/default.nix2
-rw-r--r--pkgs/tools/networking/dhcpcd/default.nix2
2 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/tools/filesystems/moosefs/default.nix b/pkgs/tools/filesystems/moosefs/default.nix
index e07ca270b5c8e..dc1d77bfa7ed4 100644
--- a/pkgs/tools/filesystems/moosefs/default.nix
+++ b/pkgs/tools/filesystems/moosefs/default.nix
@@ -35,7 +35,7 @@ stdenv.mkDerivation rec {
       "/usr/local/lib/pkgconfig" "/nonexistent"
   '';
 
-  preBuild = lib.optional stdenv.isDarwin ''
+  preBuild = lib.optionalString stdenv.isDarwin ''
     substituteInPlace config.h --replace \
       "#define HAVE_STRUCT_STAT_ST_BIRTHTIME 1" \
       "#undef HAVE_STRUCT_STAT_ST_BIRTHTIME"
diff --git a/pkgs/tools/networking/dhcpcd/default.nix b/pkgs/tools/networking/dhcpcd/default.nix
index cc1bad106f753..0962335ad1a3d 100644
--- a/pkgs/tools/networking/dhcpcd/default.nix
+++ b/pkgs/tools/networking/dhcpcd/default.nix
@@ -44,7 +44,7 @@ stdenv.mkDerivation rec {
   installFlags = [ "DBDIR=$(TMPDIR)/db" "SYSCONFDIR=${placeholder "out"}/etc" ];
 
   # Check that the udev plugin got built.
-  postInstall = lib.optional (udev != null) "[ -e ${placeholder "out"}/lib/dhcpcd/dev/udev.so ]";
+  postInstall = lib.optionalString (udev != null) "[ -e ${placeholder "out"}/lib/dhcpcd/dev/udev.so ]";
 
   meta = with lib; {
     description = "A client for the Dynamic Host Configuration Protocol (DHCP)";