diff --git a/AppRun.c.patch b/AppRun.c.patch
index 6db0a8a..10bf595 100644
--- a/AppRun.c.patch
+++ b/AppRun.c.patch
@@ -1,23 +1,14 @@
 --- a/AppRun.c
 +++ b/AppRun.c
-@@ -44,6 +44,8 @@
- 
- #define LINE_SIZE 255
- 
-+char *checkrt(char *usr_in_appdir);
-+
- int filter(const struct dirent *dir) {
-     char *p = (char*) &dir->d_name;
-     p = strrchr(p, '.');
-@@ -156,6 +158,7 @@
+@@ -156,6 +156,7 @@
      char *old_env;
      const int length = 2047;
      char new_env[8][length+1];
-+    char *optional = checkrt(usr_in_appdir);
++    checkrt(usr_in_appdir);
  
      /* https://docs.python.org/2/using/cmdline.html#envvar-PYTHONHOME */
      snprintf(new_env[0], length, "PYTHONHOME=%s/usr/", appdir);
-@@ -164,7 +167,7 @@
+@@ -164,7 +165,7 @@
      snprintf(new_env[1], length, "PATH=%s/usr/bin/:%s/usr/sbin/:%s/usr/games/:%s/bin/:%s/sbin/:%s", appdir, appdir, appdir, appdir, appdir, old_env);
  
      old_env = getenv("LD_LIBRARY_PATH") ?: "";
diff --git a/Makefile b/Makefile
index 60cb869..4d71d35 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,5 @@
 CFLAGS ?= -O2 -Wall -Wextra
+CFLAGS += -include checkrt.h
 LDFLAGS += -s
 BIN = AppRun_patched
 
diff --git a/checkrt.c b/checkrt.c
index e6cffbb..7497162 100644
--- a/checkrt.c
+++ b/checkrt.c
@@ -44,10 +44,10 @@
 #define CXXDIR "optional/libstdc++"
 #define GCCDIR "optional/libgcc"
 
+char optional[1024];
 
-char *checkrt(char *usr_in_appdir)
+void checkrt(char *usr_in_appdir)
 {
-    char path[1024];
     int ret;
     FILE *f;
     char command[LINE_SIZE];
@@ -99,22 +99,14 @@ char *checkrt(char *usr_in_appdir)
     if (gcc_bundle_ver > gcc_sys_ver)
         bundle_gcc = 1;
 
-    char *tmp;
-
     if (bundle_cxx == 1 && bundle_gcc == 0) {
-        sprintf(path, "%s/" CXXDIR ":", usr_in_appdir);
-        strcpy(tmp, path);
-        return tmp;
+        sprintf(optional, "%s/" CXXDIR ":", usr_in_appdir);
     } else if (bundle_cxx == 0 && bundle_gcc == 1) {
-        sprintf(path, "%s/" GCCDIR ":", usr_in_appdir);
-        strcpy(tmp, path);
-        return tmp;
+        sprintf(optional, "%s/" GCCDIR ":", usr_in_appdir);
     } else if (bundle_cxx == 1 && bundle_gcc == 1) {
-        sprintf(path, "%s/" GCCDIR ":%s/" CXXDIR ":", usr_in_appdir, usr_in_appdir);
-        strcpy(tmp, path);
-        return tmp;
+        sprintf(optional, "%s/" GCCDIR ":%s/" CXXDIR ":", usr_in_appdir, usr_in_appdir);
+    } else {
+        sprintf(optional, "%s", "");
     }
-
-    return "";
 }
 
diff --git a/checkrt.h b/checkrt.h
new file mode 100644
index 0000000..1cc9300
--- /dev/null
+++ b/checkrt.h
@@ -0,0 +1,2 @@
+extern char optional[1024];
+extern void checkrt(char *usr_in_appdir);