Based on https://sourceforge.net/p/cntlm/bugs/79/ but rebased on our cntlm-0.93_beta5-buildsystem.patch.
--- a/Makefile
+++ b/Makefile
@@ -20,7 +20,7 @@ LIBS		:= $(shell [ $(OS) = "SunOS" ] && echo "-lrt -lsocket -lnsl")
 LDFLAGS		:= -pthread
 CYGWIN_REQS	:= cygwin1.dll cyggcc_s-1.dll cygstdc++-6.dll cygrunsrv.exe 
 
-CFLAGS=-D__BSD_VISIBLE -D_ALL_SOURCE -D_XOPEN_SOURCE=600 -D_POSIX_C_SOURCE=200112 -D_ISOC99_SOURCE -D_REENTRANT -D_BSD_SOURCE -DVERSION=\"'$(VER)'\"
+CFLAGS=-D__BSD_VISIBLE -D_ALL_SOURCE -D_XOPEN_SOURCE=600 -D_POSIX_C_SOURCE=200112 -D_ISOC99_SOURCE -D_REENTRANT -D_BSD_SOURCE -D_DEFAULT_SOURCE -DVERSION=\"'$(VER)'\"
 ifeq ($(DEBUG),1)
 	CFLAGS	+= -g -O0
 endif
--- a/config/gethostname.c
+++ b/config/gethostname.c
@@ -1,3 +1,5 @@
+#include <stdio.h>
+#include <string.h>
 #include <unistd.h>
 
 int main(int argc, char **argv) {
--- a/configure
+++ b/configure
@@ -67,7 +67,7 @@ rm -f $CONFIG
 for i in $TESTS; do
 	printf "Checking $i... "
 	printf "#define config_$i " >> $CONFIG
-	OUT=`$CC $CFLAGS $LDFLAGS -D_POSIX_C_SOURCE=199506L -D_ISOC99_SOURCE -D_REENTRANT -o config/$i config/$i.c 2>&1`
+	OUT=`$CC $CFLAGS $LDFLAGS -D_POSIX_C_SOURCE=199506L -D_ISOC99_SOURCE -D_DEFAULT_SOURCE -D_REENTRANT -o config/$i config/$i.c 2>&1`
 	rc=$?
 
 	if [ $rc -ne 0 ]; then # -o -n "$OUT" ]; then