Use platform-independent compiler name; remove debug symbols; add -Wextra

makefile

@@ -2,8 +2,8 @@
 
 
 VERSION = 1.0
-CC      = gcc
-CFLAGS  = -Wall -g -O3 -D_REENTRANT -DVERSION=\"$(VERSION)\" 
+CC      = cc
+CFLAGS  = -Wall -Wextra -O3 -D_REENTRANT -DVERSION=\"$(VERSION)\" 
 #LDFLAGS = -lm -lpthread `gtk-config --cflags` `gtk-config --libs` -lgthread
 LDFLAGS = -lncurses