md5, sha1, sha256, sha512: fix compile error in c++ mode

[gnulib.git] / lib / execinfo.in.h

diff --git a/lib/execinfo.in.h b/lib/execinfo.in.h
index b62e183..919565f 100644 (file)
--- a/lib/execinfo.in.h
+++ b/lib/execinfo.in.h
@@ -20,6 +20,9 @@
 #ifndef _GL_EXECINFO_H
 #define _GL_EXECINFO_H
 
+#ifndef _GL_INLINE_HEADER_BEGIN
+ #error "Please include config.h first."
+#endif
 _GL_INLINE_HEADER_BEGIN
 #ifndef _GL_EXECINFO_INLINE
 # define _GL_EXECINFO_INLINE _GL_INLINE