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include(CheckCSourceCompiles)
# Check whether the namser compatibility header is required
# This can be the case on the Darwin platform
set(CMAKE_REQUIRED_INCLUDES ${BIND_INCLUDE_DIR})
check_c_source_compiles("
#include <arpa/nameser.h>
int main() { HEADER *hdr; int d = NS_IN6ADDRSZ; return 0; }"
have_nameser_header)
if (NOT have_nameser_header)
check_c_source_compiles("
#include <arpa/nameser.h>
#include <arpa/nameser_compat.h>
int main() { HEADER *hdr; int d = NS_IN6ADDRSZ; return 0; }"
NEED_NAMESER_COMPAT_H)
if (NOT NEED_NAMESER_COMPAT_H)
message(FATAL_ERROR
"Asynchronous DNS support compatibility check failed.")
endif ()
endif ()
set(CMAKE_REQUIRED_INCLUDES)
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