diff --git a/srcunx/unx.mak b/srcunx/unx.mak
index 3bd1769..ee86618 100644
--- a/srcunx/unx.mak
+++ b/srcunx/unx.mak
@@ -39,7 +39,7 @@ GSVIEW_DOCPATH=$(GSVIEW_BASE)/share/doc
 GSVIEW_ETCPATH=$(prefix)/etc
 
 MAKE=make
-CC=gcc
+CC ?= gcc
 OBJ=o
 INSTALL=install -m 644
 INSTALL_EXE=install -m 755
@@ -77,7 +77,7 @@ PLINK=-lpthread -lrt
 
 # Other possible options are -Wtraditional
 # Compiler flags for C and C++ files.
-CFLAGS=-O -Wall -Wstrict-prototypes -Wmissing-declarations -Wmissing-prototypes -fno-builtin -fno-common -Wcast-qual -Wwrite-strings $(CDEBUG) -DX11 -DUNIX -DNONAG $(RPM_OPT_FLAGS) `gtk-config --cflags` $(XINCLUDE) $(PFLAGS)
+CFLAGS += $(CDEBUG) -DX11 -DUNIX -DNONAG $(RPM_OPT_FLAGS) `gtk-config --cflags` $(XINCLUDE) $(PFLAGS)
 
 # Linker flags
 LFLAGS=$(LDEBUG) $(PLINK) `gtk-config --libs`
@@ -155,7 +155,7 @@ all: $(BD)gsview$(EXE) html
 GSVIEW_DOCDIR=$(GSVIEW_DOCPATH)/gsview-$(GSVIEW_DOT_VERSION)
 
 $(BD)gsview$(EXE): $(OBJS)
-	$(COMP) $(CFLAGS) $(FO)$(BD)gsview$(EXE) $(OBJS) $(LFLAGS)
+	$(COMP) $(CFLAGS) $(LDFLAGS) $(FO)$(BD)gsview$(EXE) $(OBJS) $(LFLAGS)
 
 install: all
 	-mkdir -p $(GSVIEW_BASE)