Gentoo Bug#334647:
Respect CC, CFLAGS, LDFLAGS (with gcc).
Support verbose building via 'make V=1'.
--- configure.orig	2012-10-02 14:01:48.735669564 +0200
+++ configure	2012-10-02 14:23:01.224271511 +0200
@@ -10,7 +10,7 @@
 # This can be disabled if neccessary.
 #
 
-CCS="xlc_r gcc"
+CCS=${CC-"xlc_r gcc"}
 
 #
 # Look for supported compilers
@@ -31,15 +31,21 @@
 else
 	echo "Using $CCPATH to compile Cntlm"
 	[ -h Makefile ] && rm -f Makefile 2>/dev/null
-	case "$CC" in
-		gcc)
+	if $CC -v >/dev/null 2>&1; then
 			# default Makefile is for GCC; just revert back to
 			# GCC if Makefile is linked to other compiler version
 			if [ ! -f Makefile ]; then
 				mv Makefile.gcc Makefile
 			fi
-			;;
-		*)
+			: ${CFLAGS=-O3}
+			: ${LDFLAGS=}
+			CFLAGS="$CFLAGS -std=c99 -Wall -Wno-unused-but-set-variable -pedantic -pthread"
+			LDFLAGS="$LDFLAGS -pthread"
+			sed -e "s~^CFLAGS=~CFLAGS=$CFLAGS ~" \
+				-e "s~^LDFLAGS=.*~LDFLAGS=$LDFLAGS~" \
+				-e "s~^CC=.*~CC=$CC~" \
+				-i Makefile
+	else
 			# backup default GCC Makefile and create a link to other
 			if [ -f Makefile ]; then
 				mv Makefile Makefile.gcc
@@ -47,8 +53,7 @@
 
 			EXT=`echo "$CC" | sed 's/_.*//'`
 			ln -s Makefile.$EXT Makefile
-			;;
-	esac
+	fi
 fi
 
 STAMP=configure-stamp
@@ -62,7 +67,7 @@
 for i in $TESTS; do
 	printf "Checking $i... "
 	printf "#define config_$i " >> $CONFIG
-	OUT=`$CC -D_POSIX_C_SOURCE=199506L -D_ISOC99_SOURCE -D_REENTRANT -o config/$i config/$i.c 2>&1`
+	OUT=`$CC $CFLAGS $LDFLAGS -D_POSIX_C_SOURCE=199506L -D_ISOC99_SOURCE -D_REENTRANT -o config/$i config/$i.c 2>&1`
 	rc=$?
 
 	if [ $rc -ne 0 ]; then # -o -n "$OUT" ]; then
--- Makefile.orig	2012-10-02 15:05:58.924914577 +0200
+++ Makefile	2012-10-02 15:10:09.644014197 +0200
@@ -15,10 +15,10 @@
 NAME=cntlm
 CC=gcc
 VER=`cat VERSION`
-CFLAGS+=$(FLAGS) -std=c99 -Wall -Wno-unused-but-set-variable -pedantic -O3 -D__BSD_VISIBLE -D_ALL_SOURCE -D_XOPEN_SOURCE=600 -D_POSIX_C_SOURCE=200112 -D_ISOC99_SOURCE -D_REENTRANT -D_BSD_SOURCE -DVERSION=\"`cat VERSION`\"
+CFLAGS=-D__BSD_VISIBLE -D_ALL_SOURCE -D_XOPEN_SOURCE=600 -D_POSIX_C_SOURCE=200112 -D_ISOC99_SOURCE -D_REENTRANT -D_BSD_SOURCE -DVERSION=\"`cat VERSION`\"
 OS=$(shell uname -s)
-OSLDFLAGS=$(shell [ $(OS) = "SunOS" ] && echo "-lrt -lsocket -lnsl")
-LDFLAGS:=-lpthread $(OSLDFLAGS)
+LIBS=$(shell [ $(OS) = "SunOS" ] && echo "-lrt -lsocket -lnsl")
+LDFLAGS=
 
 ifeq ($(findstring CYGWIN,$(OS)),)
 	OBJS=utils.o ntlm.o xcrypt.o config.o socket.o acl.o auth.o http.o forward.o direct.o scanner.o pages.o main.o
@@ -26,21 +26,28 @@
 	OBJS=utils.o ntlm.o xcrypt.o config.o socket.o acl.o auth.o http.o forward.o direct.o scanner.o pages.o main.o win/resources.o
 endif
 
+VE_=@echo
+VE_1=@:
+VE=$(VE_$(V))
+VV_=@
+VV_1=
+VV=$(VV_$(V))
+
 $(NAME): configure-stamp $(OBJS)
-	@echo "Linking $@"
-	@$(CC) $(CFLAGS) -o $@ $(OBJS) $(LDFLAGS)
+	$(VE) "Linking $@"
+	$(VV) $(CC) $(CFLAGS) -o $@ $(OBJS) $(LDFLAGS) $(LIBS)
 
 main.o: main.c
-	@echo "Compiling $<"
-	@if [ -z "$(SYSCONFDIR)" ]; then \
+	$(VE) "Compiling $<"
+	$(VV) if [ -z "$(SYSCONFDIR)" ]; then \
 		$(CC) $(CFLAGS) -c main.c -o $@; \
 	else \
 		$(CC) $(CFLAGS) -DSYSCONFDIR=\"$(SYSCONFDIR)\" -c main.c -o $@; \
 	fi
 
 .c.o:
-	@echo "Compiling $<"
-	@$(CC) $(CFLAGS) -c -o $@ $<
+	$(VE) "Compiling $<"
+	$(VV) $(CC) $(CFLAGS) -c -o $@ $<
 
 install: $(NAME)
 	# Special handling for install(1)
@@ -123,17 +130,17 @@
 	@echo
 
 win/resources.o: win/resources.rc
-	@echo Adding EXE resources
-	@windres $^ -o $@
+	$(VE) Adding EXE resources
+	$(VV) windres $^ -o $@
 
 uninstall:
 	rm -f $(BINDIR)/$(NAME) $(MANDIR)/man1/$(NAME).1 2>/dev/null || true
 
 clean:
-	@rm -f *.o cntlm cntlm.exe configure-stamp build-stamp config/config.h 2>/dev/null
-	@rm -f win/*.exe win/*.dll win/*.iss win/*.pdf win/cntlm.ini win/license.txt win/resouces.o 2>/dev/null
-	@rm -f config/endian config/gethostname config/strdup config/socklen_t config/*.exe
-	@if [ -h Makefile ]; then rm -f Makefile; mv Makefile.gcc Makefile; fi
+	$(VV) rm -f *.o cntlm cntlm.exe configure-stamp build-stamp config/config.h 2>/dev/null
+	$(VV) rm -f win/*.exe win/*.dll win/*.iss win/*.pdf win/cntlm.ini win/license.txt win/resouces.o 2>/dev/null
+	$(VV) rm -f config/endian config/gethostname config/strdup config/socklen_t config/*.exe
+	$(VV) if [ -h Makefile ]; then rm -f Makefile; mv Makefile.gcc Makefile; fi
 
 distclean: clean
 	if [ `id -u` = 0 ]; then \
@@ -143,4 +150,4 @@
 		fakeroot debian/rules clean; \
 		fakeroot rpm/rules clean; \
 	fi
-	@rm -f *.exe *.deb *.rpm *.tgz *.tar.gz *.tar.bz2 tags ctags pid 2>/dev/null
+	$(VV) rm -f *.exe *.deb *.rpm *.tgz *.tar.gz *.tar.bz2 tags ctags pid 2>/dev/null