diff --git a/Makefile b/Makefile
index 1601079a48685..56858b3766bdb 100644
--- a/Makefile
+++ b/Makefile
@@ -30,8 +30,8 @@ endif
 # Compile flags
 #
 
-CFLAGS   = -I.              -O3 -DNDEBUG -std=c11   -fPIC
-CXXFLAGS = -I. -I./examples -O3 -DNDEBUG -std=c++11 -fPIC
+CFLAGS   = -I.              -O3 -DNDEBUG -std=c11   -fPIC -g -fno-omit-frame-pointer
+CXXFLAGS = -I. -I./examples -O3 -DNDEBUG -std=c++11 -fPIC -g -fno-omit-frame-pointer
 LDFLAGS  =
 
 # OS specific
diff --git a/ggml.c b/ggml.c
index 42621267b2b7d..67fd549378c82 100644
--- a/ggml.c
+++ b/ggml.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
 #include "ggml.h"
 
 #if defined(_MSC_VER) || defined(__MINGW32__)