build: mergesort is in <stdlib.h> on MacOS.

* configure: add mergesort to list of clashing
identifiers to handle.

1 files changed, 1 insertions, 1 deletions

diff --git a/configure b/configure
index d2d62d2d..5f070195 100755
--- a/configure
+++ b/configure
@@ -1169,7 +1169,7 @@ fi
 
 printf "Checking for name clashes caused by nonconforming toolchains ... "
 
-for ident in trunc floorf random longlong_t ; do
+for ident in trunc floorf random longlong_t mergesort ; do
   cat > conftest.c <<!
 #include <assert.h>
 #include <ctype.h>