diff --git a/platform/x11/platform_config.h b/platform/x11/platform_config.h
index d14f3e3f9a..21703969cc 100644
--- a/platform/x11/platform_config.h
+++ b/platform/x11/platform_config.h
@@ -26,7 +26,13 @@
 /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
+#ifdef __linux__
 #include <alloca.h>
+#endif
+#ifdef __FreeBSD__
+#include <stdlib.h>
+#endif
+
 #define GLES2_INCLUDE_H "gl_context/glew.h"
 #define GLES1_INCLUDE_H "gl_context/glew.h"