Don't include linux/ptrace.h for glibc.
diff --git a/syscall.c b/syscall.c
index 045ad27..4504e4c 100644
--- a/syscall.c
+++ b/syscall.c
@@ -41,7 +41,7 @@
 # include <sys/reg.h>
 #endif
 
-#ifdef LINUX
+#if defined LINUX && __GLIBC__ < 2
 #include <linux/ptrace.h>
 #endif /* LINUX */