# Conditionally include execinfo as it's not available on all libc
# systems. There is a PR upstream for a similiar issue but the actual
# issus is not reproducable on Gentoo [math library not found] [1], so
# for now this is a temporary fix and can be removed once the PR [1]
# is merged upstream.
# [1]: https://github.com/Unidata/netcdf-c/pull/1701
#
# Closes: https://bugs.gentoo.org/828677
--- a/libhdf5/hdf5debug.c
+++ b/libhdf5/hdf5debug.c
@@ -5,7 +5,7 @@
 #include "config.h"
 #include <stdarg.h>
 #include <stdio.h>
-#if !defined _WIN32 && !defined __CYGWIN__
+#ifdef HAVE_EXECINFO_H
 #include <execinfo.h>
 #endif

@@ -15,15 +15,18 @@

 #define STSIZE 1000

+#ifdef HAVE_EXECINFO_H
 #ifdef H5BACKTRACE
 #  if !defined _WIN32 && !defined __CYGWIN__
 static void* stacktrace[STSIZE];
 #  endif
 #endif
+#endif

 int
 nch5breakpoint(int err)
 {
+#ifdef HAVE_EXECINFO_H
 #ifdef H5BACKTRACE
 #  if !defined _WIN32 && !defined __CYGWIN__
     int count = 0;
@@ -39,6 +42,7 @@ nch5breakpoint(int err)
     if(trace != NULL) free(trace);
 #    endif
 #  endif
+#endif
 #endif
     return err;
 }