stdenv: installTargets is a list

pkgs/development/compilers/gcc/8/default.nix

@@ -208,10 +208,7 @@ stdenv.mkDerivation ({
 
   dontStrip = !stripped;
 
-  installTargets =
-    if stripped
-    then "install-strip"
-    else "install";
+  installTargets = optional stripped "install-strip";
 
   # https://gcc.gnu.org/install/specific.html#x86-64-x-solaris210
   ${if hostPlatform.system == "x86_64-solaris" then "CC" else null} = "gcc -m64";

pkgs/development/tools/misc/texinfo/common.nix

@@ -30,10 +30,8 @@ stdenv.mkDerivation {
   configureFlags = [ "PERL=${buildPackages.perl}/bin/perl" ]
     ++ stdenv.lib.optional stdenv.isSunOS "AWK=${gawk}/bin/awk";
 
-  preInstall = ''
-    installFlags="TEXMF=$out/texmf-dist";
-    installTargets="install install-tex";
-  '';
+  installFlags = [ "TEXMF=$(out)/texmf-dist" ];
+  installTargets = [ "install" "install-tex" ];
 
   checkInputs = [ procps ];