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 15:31:03.986270993 +0200
+++ Makefile	2012-10-02 15:40:10.277689068 +0200
@@ -16,14 +16,13 @@
 CC		:= gcc
 VER		:= $(shell 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		:= -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=\"'$(VER)'\"
 ifeq ($(DEBUG),1)
-	CFLAGS	+= -g  -std=c99 -Wall -pedantic -D__BSD_VISIBLE -D_ALL_SOURCE -D_XOPEN_SOURCE=600 -D_POSIX_C_SOURCE=200112 -D_ISOC99_SOURCE -D_REENTRANT -D_BSD_SOURCE -DVERSION=\"'$(VER)'\"
-else
-	CFLAGS	+= -O3 -std=c99 -D__BSD_VISIBLE -D_ALL_SOURCE -D_XOPEN_SOURCE=600 -D_POSIX_C_SOURCE=200112 -D_ISOC99_SOURCE -D_REENTRANT -D_BSD_SOURCE -DVERSION=\"'$(VER)'\"
+	CFLAGS	+= -g -O0
 endif
 
 ifneq ($(findstring CYGWIN,$(OS)),)
@@ -32,28 +31,35 @@
 	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
 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
 
 %.o: %.c
-	@echo "Compiling $<"
-	@$(CC) $(CFLAGS) -c -o $@ $<
+	$(VE) "Compiling $<"
+	$(VV) $(CC) $(CFLAGS) -c -o $@ $<
 
 configure-stamp:
 	./configure
 
 win/resources.o: win/resources.rc
-	@echo Adding EXE resources
-	@windres $^ -o $@
+	$(VE) Adding EXE resources
+	$(VV) windres $^ -o $@
 
 install: $(NAME)
 	# Special handling for install(1)
@@ -115,31 +121,31 @@
 
 $(NAME)-$(VER)-win32.exe:
 	@echo - preparing binaries for GUI installer
-	@cp $(patsubst %, /bin/%, $(CYGWIN_REQS)) win/
+	$(VV) cp $(patsubst %, /bin/%, $(CYGWIN_REQS)) win/
 ifeq ($(DEBUG),1)
-	@cp -p cntlm.exe win/
+	$(VV) cp -p cntlm.exe win/
 else
-	@strip -o win/cntlm.exe cntlm.exe
+	$(VV) strip -o win/cntlm.exe cntlm.exe
 endif
 	@echo - generating GUI installer
-	@win/Inno5/ISCC.exe /Q win/setup.iss #/Q win/setup.iss
+	$(VV) win/Inno5/ISCC.exe /Q win/setup.iss #/Q win/setup.iss
 
 $(NAME)-$(VER)-win32.zip: 
 	@echo - creating ZIP release for manual installs
-	@ln -s win $(NAME)-$(VER)
+	$(VV) ln -s win $(NAME)-$(VER)
 	zip -9 $(NAME)-$(VER)-win32.zip $(patsubst %, $(NAME)-$(VER)/%, $(CYGWIN_REQS) cntlm.ini LICENSE.txt cntlm_manual.pdf) 
-	@rm -f $(NAME)-$(VER)
+	$(VV) rm -f $(NAME)-$(VER)
 
 win/cntlm.ini: doc/cntlm.conf 
-	@cat doc/cntlm.conf | unix2dos > win/cntlm.ini
+	$(VV) cat doc/cntlm.conf | unix2dos > win/cntlm.ini
 
 win/LICENSE.txt: COPYRIGHT LICENSE
-	@cat COPYRIGHT LICENSE | unix2dos > win/LICENSE.txt
+	$(VV) cat COPYRIGHT LICENSE | unix2dos > win/LICENSE.txt
 
 win/cntlm_manual.pdf: doc/cntlm.1 
 	@echo - generating PDF manual
-	@rm -f win/cntlm_manual.pdf
-	@groff -t -e -mandoc -Tps doc/cntlm.1 | ps2pdf - win/cntlm_manual.pdf
+	$(VV) rm -f win/cntlm_manual.pdf
+	$(VV) groff -t -e -mandoc -Tps doc/cntlm.1 | ps2pdf - win/cntlm_manual.pdf
 
 win/setup.iss: win/setup.iss.in
 ifeq ($(findstring CYGWIN,$(OS)),)
@@ -148,16 +154,16 @@
 	@echo
 	@exit 1
 endif
-	@sed "s/\$$VERSION/$(VER)/g" $^ > $@
+	$(VV) sed "s/\$$VERSION/$(VER)/g" $^ > $@
 
 uninstall:
 	rm -f $(BINDIR)/$(NAME) $(MANDIR)/man1/$(NAME).1 2>/dev/null || true
 
 clean:
-	@rm -f config/endian config/gethostname config/strdup config/socklen_t config/*.exe
-	@rm -f *.o cntlm cntlm.exe configure-stamp build-stamp config/config.h
+	$(VV) rm -f config/endian config/gethostname config/strdup config/socklen_t config/*.exe
+	$(VV) rm -f *.o cntlm cntlm.exe configure-stamp build-stamp config/config.h
 	rm -f $(patsubst %, win/%, $(CYGWIN_REQS) cntlm.exe cntlm.ini LICENSE.txt setup.iss cntlm_manual.pdf)
-	@if [ -h Makefile ]; then rm -f Makefile; mv Makefile.gcc Makefile; fi
+	$(VV) if [ -h Makefile ]; then rm -f Makefile; mv Makefile.gcc Makefile; fi
 
 distclean: clean
 ifeq ($(findstring CYGWIN,$(OS)),)
@@ -169,6 +175,6 @@
 		fakeroot rpm/rules clean; \
 	fi
 endif
-	@rm -f *.exe *.deb *.rpm *.tgz *.tar.gz *.tar.bz2 *.zip *.exe tags ctags pid 2>/dev/null
+	$(VV) rm -f *.exe *.deb *.rpm *.tgz *.tar.gz *.tar.bz2 *.zip *.exe tags ctags pid 2>/dev/null
 
 .PHONY: all install tgz tbz2 deb rpm win uninstall clean distclean