+#-----------------------------------------------------------------------------
+# Test if os defines a lenght for sockaddr
+IF("HAVE_SA_LEN" MATCHES "^HAVE_SA_LEN$")
+ STRING(ASCII 35 POUND)
+ FILE(WRITE ${GDCM_BINARY_DIR}/CMakeTmp/gdcmTestHAVESALEN.c
+ "${POUND}include <sys/types.h>\n"
+ "${POUND}include <sys/socket.h>\n"
+ "int main() { struct sockaddr sa; sa.sa_len = 0; }")
+ MESSAGE(STATUS "Checking if ifreq has a sa_len")
+ TRY_COMPILE(HAVE_SA_LEN
+ ${GDCM_BINARY_DIR}
+ ${GDCM_BINARY_DIR}/CMakeTmp/gdcmTestHAVESALEN.c
+ OUTPUT_VARIABLE OUTPUT)
+ IF(HAVE_SA_LEN)
+ MESSAGE(STATUS "Checking if ifreq has a sa_len -- yes")
+ SET(HAVE_SA_LEN 1 CACHE INTERNAL "Support if ifreq has a sa_len")
+ WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeOutput.log
+ "Determining if ifreq has a sa_len"
+ "passed with the following output:\n"
+ "${OUTPUT}\n" APPEND)
+ ELSE(HAVE_SA_LEN)
+ MESSAGE(STATUS "Checking if ifreq has a sa_len -- no")
+ SET(HAVE_SA_LEN 0 CACHE INTERNAL "Support if ifreq has a sa_len")
+ WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeError.log
+ "Determining if ifreq has a sa_len"
+ "failed with the following output:\n"
+ "${OUTPUT}\n" APPEND)
+ ENDIF(HAVE_SA_LEN)
+ENDIF("HAVE_SA_LEN" MATCHES "^HAVE_SA_LEN$")
+