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A recent patch introduced new code for sig2str/str2sig. This code does not properly exclude code that requires SIGRTMIN/SIGRTMAX to be defined and triggers the following compile error: newlib/libc/signal/sig2str.c:199:8: error: 'SIGRTMIN' undeclared newlib/libc/signal/sig2str.c:200:29: error: 'SIGRTMAX' undeclared Let's add the missing guards. Fixes: 2b50ec0cd205 ("libc: Fix compilation for new sig2str/str2sig implementation") Signed-off-by: Christoph Muellner <cmuellner@gcc.gnu.org>