Index: uspace/lib/c/test/stdio/scanf.c
===================================================================
--- uspace/lib/c/test/stdio/scanf.c	(revision 5284faa97b1bbcf3adb6f3a8f5a3bfc1f2f514d2)
+++ uspace/lib/c/test/stdio/scanf.c	(revision 06e0f37b2f97829f85d3054ff2902fab11f4ff9b)
@@ -43,4 +43,6 @@
 
 #pragma GCC diagnostic ignored "-Wformat-zero-length"
+#pragma GCC diagnostic ignored "-Wformat"
+#pragma GCC diagnostic ignored "-Wformat-extra-args"
 
 PCUT_INIT;
Index: uspace/lib/c/test/string.c
===================================================================
--- uspace/lib/c/test/string.c	(revision 5284faa97b1bbcf3adb6f3a8f5a3bfc1f2f514d2)
+++ uspace/lib/c/test/string.c	(revision 06e0f37b2f97829f85d3054ff2902fab11f4ff9b)
@@ -28,7 +28,6 @@
 
 /* Prevent an error from being generated */
-#undef _HELENOS_SOURCE
+#define _REALLY_WANT_STRING_H
 #include <string.h>
-#define _HELENOS_SOURCE
 #include <pcut/pcut.h>
 
Index: uspace/lib/posix/test/stdlib.c
===================================================================
--- uspace/lib/posix/test/stdlib.c	(revision 5284faa97b1bbcf3adb6f3a8f5a3bfc1f2f514d2)
+++ uspace/lib/posix/test/stdlib.c	(revision 06e0f37b2f97829f85d3054ff2902fab11f4ff9b)
@@ -33,4 +33,6 @@
 #include <stdlib.h>
 #include <unistd.h>
+
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 
 PCUT_INIT;