diff --git a/Makefile b/Makefile
index 156ea96..a0997b1 100644
--- a/Makefile
+++ b/Makefile
@@ -52,7 +52,7 @@ INSTALL_PREFIX = /var/tmp/portage/dev-lang/duktape-2.6.0/image/usr
 DUKTAPE_SRCDIR = ./src
 #DUKTAPE_SRCDIR = ./src-noline
 
-CC = gcc
+CC ?= gcc
 
 .PHONY: all
 all: libduktape.$(SO_REALNAME_SUFFIX) libduktaped.$(SO_REALNAME_SUFFIX)
@@ -62,11 +62,11 @@ all: libduktape.$(SO_REALNAME_SUFFIX) libduktaped.$(SO_REALNAME_SUFFIX)
 # to $INSTALL_PREFIX/include on installation.
 
 libduktape.$(SO_REALNAME_SUFFIX):
-	$(CC) -shared -fPIC -Wall -Wextra -Os -Wl,$(LD_SONAME_ARG),libduktape.$(SO_SONAME_SUFFIX) \
+	$(CC) -shared -fPIC ${CFLAGS} ${LDFLAGS} -Wl,$(LD_SONAME_ARG),libduktape.$(SO_SONAME_SUFFIX) -lm \
 		-o $@ $(DUKTAPE_SRCDIR)/duktape.c
 
 libduktaped.$(SO_REALNAME_SUFFIX):
-	$(CC) -shared -fPIC -g -Wall -Wextra -Os -Wl,$(LD_SONAME_ARG),libduktaped.$(SO_SONAME_SUFFIX) \
+	$(CC) -shared -fPIC ${CFLAGS} ${LDFLAGS}  -Wl,$(LD_SONAME_ARG),libduktaped.$(SO_SONAME_SUFFIX) -lm \
 		-o $@ $(DUKTAPE_SRCDIR)/duktape.c
 
 # Symlinks depend on platform conventions.
@@ -85,4 +85,4 @@ install: libduktape.$(SO_REALNAME_SUFFIX) libduktaped.$(SO_REALNAME_SUFFIX)
 
 CCOPTS = -I./examples/cmdline
 duk:
-	$(CC) $(CCOPTS) -I$(INSTALL_PREFIX)/include -L$(INSTALL_PREFIX)/lib64 -Wall -Wextra -Os -o $@ ./examples/cmdline/duk_cmdline.c -lduktape -lm
+	$(CC) $(CCOPTS) -I$(INSTALL_PREFIX)/include -L$(INSTALL_PREFIX)/lib64 ${CFLAGS} -o $@ ./examples/cmdline/duk_cmdline.c -lduktape -lm