Follow the convention used in (some) other cores.

Makefile.libretro

@@ -29,8 +29,8 @@ else ifneq ($(findstring MINGW,$(shell uname -a)),)
 endif
 
 TARGET_NAME := 2048
-GIT_VERSION := "$(shell git describe --abbrev=7 --dirty --always --tags || echo unknown)"
-ifneq ($(GIT_VERSION),"unknown")
+GIT_VERSION := " $(shell git rev-parse --short HEAD || echo unknown)"
+ifneq ($(GIT_VERSION)," unknown")
 	CFLAGS += -DGIT_VERSION=\"$(GIT_VERSION)\"
 endif
 LIBM := -lm

jni/Android.mk

@@ -4,6 +4,11 @@ include $(CLEAR_VARS)
 
 LOCAL_MODULE    := retro
 
+GIT_VERSION := " $(shell git rev-parse --short HEAD || echo unknown)"
+ifneq ($(GIT_VERSION)," unknown")
+	LOCAL_CFLAGS += -DGIT_VERSION=\"$(GIT_VERSION)\"
+endif
+
 ifeq ($(TARGET_ARCH),arm)
 LOCAL_CFLAGS += -DANDROID_ARM
 LOCAL_ARM_MODE := arm

libretro.c

@@ -127,11 +127,10 @@ void retro_get_system_info(struct retro_system_info *info)
 {
    memset(info, 0, sizeof(*info));
    info->library_name     = "2048";
-#ifdef GIT_VERSION
-   info->library_version  = GIT_VERSION;
-#else
-   info->library_version  = "v1.0";
+#ifndef GIT_VERSION
+#define GIT_VERSION ""
 #endif
+   info->library_version  = "v1.0" GIT_VERSION;
    info->need_fullpath    = false;
    info->valid_extensions = NULL; /* Anything is fine, we don't care. */
 }