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build: fix mkdtemp check on macOS
On macOS, mkdtemp is in unistd.h. Fix the CMake check so that is works.
Upstreamed in https://github.com/zeromq/libzmq/pull/4668.
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -599,7 +599,7 @@ if(NOT MSVC)
check_cxx_symbol_exists(fork unistd.h HAVE_FORK)
check_cxx_symbol_exists(gethrtime sys/time.h HAVE_GETHRTIME)
- check_cxx_symbol_exists(mkdtemp stdlib.h HAVE_MKDTEMP)
+ check_cxx_symbol_exists(mkdtemp "stdlib.h;unistd.h" HAVE_MKDTEMP)
check_cxx_symbol_exists(accept4 sys/socket.h HAVE_ACCEPT4)
check_cxx_symbol_exists(strnlen string.h HAVE_STRNLEN)
else()
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