2 files changed, 3 insertions, 2 deletions
diff --git a/Makefile b/Makefile
index 4c67769..4d910b2 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,7 @@
 # cqrlogo - CGI QR-Code logo for web services
 
 CC	:= gcc
+CFLAGS	+= -O2 -Wall -Werror
 CFLAGS	+= $(shell pkg-config --cflags --libs gdk-pixbuf-2.0) \
 	   $(shell pkg-config --cflags --libs libqrencode)
 
diff --git a/cqrlogo.c b/cqrlogo.c
index 5e522cb..e0d76c2 100644
--- a/cqrlogo.c
+++ b/cqrlogo.c
@@ -27,10 +27,10 @@ GdkPixbuf * encode_qrcode (char *text, int scale) {
        QRcode *qrcode;
        GdkPixbuf *pixbuf, *pixbuf_scaled;
        int i, j, k, rowstride, channels;
-       gchar *pixel;
+       guchar *pixel;
        unsigned char *data;
        
-       qrcode = QRcode_encodeData(strlen(text), text, 0, QRCODE_LEVEL);
+       qrcode = QRcode_encodeData(strlen(text), (unsigned char *)text, 0, QRCODE_LEVEL);
 
        if (qrcode == NULL)
                return NULL;