accept optional CFLAGS variable

HIME_CFLAGS.diff

diff --git a/configure b/configure
index d6dc075..4f3e715 100755
--- a/configure
+++ b/configure
@@ -233,7 +233,8 @@ if [ $USE_ANTHY = 'Y' ] || [ $USE_CHEWING = 'Y' ]; then
   BUILD_MODULE='Y'
 fi
 
-OPTFLAGS="-O"
+OPTFLAGS=${CFLAGS:--O}
+HIME_DEBUG=${HIME_DEBUG:-0}
 
 if [ -z $CC ]; then
   CC=gcc
@@ -289,7 +290,7 @@ echo "BUILD_MODULE=$BUILD_MODULE" >> config.mak
 
 if [ $prefix = /usr/local ]; then
   echo "hime_ld_run_path=$PWD:\$(himelibdir)" >> config.mak
-  echo "HIME_DEBUG=0" >> config.mak
+  echo "HIME_DEBUG=${HIME_DEBUG}" >> config.mak
 else
   echo "hime_ld_run_path=\$(himelibdir)" >> config.mak
 fi
diff --git a/suffixes-rule b/suffixes-rule
index 7ac6493..b4e10eb 100644
--- a/suffixes-rule
+++ b/suffixes-rule
@@ -12,7 +12,7 @@
        $(CCX) $(CFLAGS) -E -o $@ $<
 
 
-CFLAGS= -DUNIX=1 $(WALL) $(OPTFLAGS) $(GTKINC) -I./IMdkit/include -I./im-client -DDEBUG="0$(HIME_DEBUG)" \
+CFLAGS= -DUNIX=1 $(WALL) $(OPTFLAGS) $(GTKINC) -I./IMdkit/include -I./im-client \
         -DHIME_TABLE_DIR=\"$(HIME_TABLE_DIR)\" \
         -DHIME_OGG_DIR=\"$(HIME_OGG_DIR)\" \
         -DDOC_DIR=\"$(DOC_DIR)\" \