zsnes: fix build against zlib-1.3

Without the change builda fails on `master` as
https://hydra.nixos.org/build/238481288/nixlog/3:

    checking for zlib - version >= 1.2.3... 1.3, bad version string given
        by zlib, sometimes due to very old zlibs that didnt correctly
        define their version. Please upgrade if you are running an
        old zlib... no

The failure happens due to 2-digit zlib version string.
Add a trivial change to allow 2-digit support in addition to existing
3-digit ones..

2 files changed, 43 insertions, 0 deletions

diff --git a/pkgs/applications/emulators/zsnes/default.nix b/pkgs/applications/emulators/zsnes/default.nix
index 1583777a058f7..059c069d6069f 100644
--- a/pkgs/applications/emulators/zsnes/default.nix
+++ b/pkgs/applications/emulators/zsnes/default.nix
@@ -23,6 +23,8 @@ in stdenv.mkDerivation {
     sha256 = "1gy79d5wdaacph0cc1amw7mqm7i0716n6mvav16p1svi26iz193v";
   };
 
+  patches = [ ./zlib-1.3.patch ];
+
   buildInputs = [ nasm SDL zlib libpng ncurses libGLU libGL ];
 
   prePatch = ''
diff --git a/pkgs/applications/emulators/zsnes/zlib-1.3.patch b/pkgs/applications/emulators/zsnes/zlib-1.3.patch
new file mode 100644
index 0000000000000..0c4771f089253
--- /dev/null
+++ b/pkgs/applications/emulators/zsnes/zlib-1.3.patch
@@ -0,0 +1,41 @@
+Add support for 2-digit zlib version like "1.3".
+--- a/src/acinclude.m4
++++ b/src/acinclude.m4
+@@ -67,7 +67,7 @@ char* my_strdup (char *str)
+ 
+ int main (int argc, char *argv[])
+ {
+-  int major, minor, micro, zlib_major_version, zlib_minor_version, zlib_micro_version;
++  int major, minor, micro, zlib_major_version, zlib_minor_version, zlib_micro_version = 0;
+ 
+   char *zlibver, *tmp_version;
+ 
+@@ -85,7 +85,7 @@ int main (int argc, char *argv[])
+     printf("%s, bad version string for\n\tmin_zlib_version... ", "$min_zlib_version");
+     exit(1);
+   }
+-  if (sscanf(zlibver, "%d.%d.%d", &zlib_major_version, &zlib_minor_version, &zlib_micro_version) != 3) {
++  if (sscanf(zlibver, "%d.%d.%d", &zlib_major_version, &zlib_minor_version, &zlib_micro_version) != 3 && sscanf(zlibver, "%d.%d", &zlib_major_version, &zlib_minor_version) != 2) {
+     printf("%s, bad version string given\n", zlibver);
+     puts("\tby zlib, sometimes due to very old zlibs that didnt correctly");
+     printf("\tdefine their version. Please upgrade if you are running an\n\told zlib... ");
+--- a/src/configure
++++ b/src/configure
+@@ -3817,7 +3817,7 @@ char* my_strdup (char *str)
+ 
+ int main (int argc, char *argv[])
+ {
+-  int major, minor, micro, zlib_major_version, zlib_minor_version, zlib_micro_version;
++  int major, minor, micro, zlib_major_version, zlib_minor_version, zlib_micro_version = 0;
+ 
+   char *zlibver, *tmp_version;
+ 
+@@ -3835,7 +3835,7 @@ int main (int argc, char *argv[])
+     printf("%s, bad version string for\n\tmin_zlib_version... ", "$min_zlib_version");
+     exit(1);
+   }
+-  if (sscanf(zlibver, "%d.%d.%d", &zlib_major_version, &zlib_minor_version, &zlib_micro_version) != 3) {
++  if (sscanf(zlibver, "%d.%d.%d", &zlib_major_version, &zlib_minor_version, &zlib_micro_version) != 3 && sscanf(zlibver, "%d.%d", &zlib_major_version, &zlib_minor_version) != 2) {
+     printf("%s, bad version string given\n", zlibver);
+     puts("\tby zlib, sometimes due to very old zlibs that didnt correctly");
+     printf("\tdefine their version. Please upgrade if you are running an\n\told zlib... ");