treewide: installFlags is a list

pkgs/development/libraries/farbfeld/default.nix

@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
   buildInputs = [ libpng libjpeg ];
   nativeBuildInputs = [ makeWrapper ];
 
-  installFlags = "PREFIX=/ DESTDIR=$(out)";
+  installFlags = [ "PREFIX=/" "DESTDIR=$(out)" ];
   postInstall = ''
     wrapProgram "$out/bin/2ff" --prefix PATH : "${file}/bin"
   '';

pkgs/development/libraries/fontconfig/2.10.nix

@@ -30,7 +30,7 @@ stdenv.mkDerivation rec {
   doCheck = true;
 
   # Don't try to write to /var/cache/fontconfig at install time.
-  installFlags = "sysconfdir=$(out)/etc fc_cachedir=$(TMPDIR)/dummy RUN_FC_CACHE_TEST=false";
+  installFlags = [ "sysconfdir=$(out)/etc" "fc_cachedir=$(TMPDIR)/dummy" "RUN_FC_CACHE_TEST=false" ];
 
   passthru = {
     # Empty for backward compatibility, there was no versioning before 2.11

pkgs/development/libraries/libguestfs/default.nix

@@ -46,7 +46,7 @@ stdenv.mkDerivation rec {
     ++ stdenv.lib.optionals (!javaSupport) [ "--disable-java" "--without-java" ];
   patches = [ ./libguestfs-syms.patch ];
   NIX_CFLAGS_COMPILE="-I${libxml2.dev}/include/libxml2/";
-  installFlags = "REALLY_INSTALL=yes";
+  installFlags = [ "REALLY_INSTALL=yes" ];
   enableParallelBuilding = true;
 
   postInstall = ''

pkgs/development/libraries/libosmpbf/default.nix

@@ -12,7 +12,7 @@ stdenv.mkDerivation {
 
   sourceRoot = "OSM-binary-1.3.3/src";
 
-  installFlags = "PREFIX=$(out)";
+  installFlags = [ "PREFIX=$(out)" ];
 
   meta = {
     homepage = https://github.com/scrosby/OSM-binary;

pkgs/development/libraries/libspotify/default.nix

@@ -50,11 +50,11 @@ else stdenv.mkDerivation {
   buildInputs = stdenv.lib.optional (stdenv.hostPlatform.system == "x86_64-darwin") unzip;
 
   # linux-specific
-  installFlags = stdenv.lib.optionalString (isLinux)
+  installFlags = stdenv.lib.optional isLinux
     "prefix=$(out)";
-  patchPhase = stdenv.lib.optionalString (isLinux)
+  patchPhase = stdenv.lib.optionalString isLinux
     "${gnused}/bin/sed -i 's/ldconfig//' Makefile";
-  postInstall = stdenv.lib.optionalString (isLinux)
+  postInstall = stdenv.lib.optionalString isLinux
     "mv -v share $out";
 
   passthru = {

pkgs/development/libraries/science/biology/htslib/default.nix

@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
 
   configureFlags = [ "--enable-libcurl" ]; # optional but strongly recommended
 
-  installFlags = "prefix=$(out)";
+  installFlags = [ "prefix=$(out)" ];
 
   preCheck = ''
     patchShebangs test/

pkgs/development/libraries/shhmsg/default.nix

@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     sha256 = "0ax02fzqpaxr7d30l5xbndy1s5vgg1ag643c7zwiw2wj1czrxil8";
   };
 
-  installFlags = "INSTBASEDIR=$(out)";
+  installFlags = [ "INSTBASEDIR=$(out)" ];
 
   meta = with stdenv.lib; {
     description = "A library for displaying messages";

pkgs/development/libraries/shhopt/default.nix

@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     sha256 = "0yd6bl6qw675sxa81nxw6plhpjf9d2ywlm8a5z66zyjf28sl7sds";
   };
 
-  installFlags = "INSTBASEDIR=$(out)";
+  installFlags = [ "INSTBASEDIR=$(out)" ];
 
   meta = with stdenv.lib; {
     description = "A library for parsing command line options";