check for git & have branch be a no-op if it doesn't exist on this sy…

…stem

configure.sh

@@ -70,6 +70,7 @@ AC_DEFINE THEME_CF "$THEME_CF"
 test "$DEBIAN_GLITCH" && AC_DEFINE 'DEBIAN_GLITCH' 1
 
 AC_PROG_CC
+AC_QUIET AC_PROG git && AC_DEFINE 'HAS_GIT' '1'
 AC_CHECK_NORETURN
 
 test "$TRY_SHARED" && AC_COMPILER_PIC && AC_CC_SHLIBS

tools/branch.c

@@ -8,6 +8,7 @@ main(argc, argv)
 int argc;
 char **argv;
 {
+#if HAS_GIT
     FILE * pipe;
 
     char line[1024];
@@ -23,5 +24,6 @@ char **argv;
 	    printf("\"(%s)\"", line);
     }
     pclose(pipe);
+#endif
     return 0;
 }