Add package: pcg-c

Also, add myself as maintainer.

pkgs/development/libraries/pcg-c/default.nix

@@ -0,0 +1,38 @@
+{ stdenv, fetchzip }:
+
+with stdenv.lib;
+
+stdenv.mkDerivation rec {
+  version = "0.94";
+  name = "pcg-c-${version}";
+
+  src = fetchzip {
+    url = "http://www.pcg-random.org/downloads/${name}.zip";
+    sha256 = "0smm811xbvs03a5nc2668zd0178wnyri2h023pqffy767bpy1vlv";
+  };
+
+  enableParallelBuilding = true;
+
+  patches = [
+    ./prefix-variable.patch
+    ];
+
+  preInstall = ''
+    sed -i s,/usr/local,$out, Makefile
+    mkdir -p $out/lib $out/include
+  '';
+
+  meta = {
+    description = "A family of better random number generators";
+    homepage = "http://www.pcg-random.org/";
+    license = stdenv.lib.licenses.asl20;
+    longDescription = ''
+      PCG is a family of simple fast space-efficient statistically good
+      algorithms for random number generation. Unlike many general-purpose RNGs,
+      they are also hard to predict.
+    '';
+    platforms = platforms.unix;
+    maintainers = [ maintainers.linus ];
+    repositories.git = git://github.com/imneme/pcg-c.git;
+  };
+}

pkgs/development/libraries/pcg-c/prefix-variable.patch

@@ -0,0 +1,15 @@
+diff --git a/Makefile b/Makefile
+index dddea44..fdb9401 100644
+--- a/Makefile
++++ b/Makefile
+@@ -30,8 +30,8 @@ all:
+ PREFIX = /usr/local
+ 
+ install: all
+-	install src/libpcg_random.a $PREFIX/lib
+-	install -m 0644 include/pcg_variants.h $PREFIX/include
++	install src/libpcg_random.a ${PREFIX}/lib
++	install -m 0644 include/pcg_variants.h ${PREFIX}/include
+ 
+ test:   all
+ 	cd test-low; $(MAKE) test