Added some more Mac OS X compatibility stuff:

- use optimization level -O3, which is supported by both gcc and clang
- removed a set of unnecessary parenthesis
- added info about 'brew' on Mac OS X to INSTALL file

bumped version number to 2.13.3

INSTALL

@@ -23,6 +23,8 @@ Prerequisites
 -------------
 - Imlib2 shared library and development headers. On a Debian or Ubuntu system
   they are provided by the packages libimlib2 and libimlib2-dev.
+  On Mac OS X you can use 'brew' to install Imlib2: brew install imlib2
+  (see http://mxcl.github.com/homebrew/)
 - Build tools, e.g. build-essential on a Debian (or Ubuntu) system.
 - To build a .deb package, you probably need the debhelper package.
 - To create an HTML version of the man page, you need rman.

Makefile

@@ -1,4 +1,4 @@
-CFLAGS := -D_FORTIFY_SOURCE=2 -Wall -W -Wextra -pedantic -Werror -pedantic-errors $(shell imlib2-config --cflags) -O6
+CFLAGS := -D_FORTIFY_SOURCE=2 -Wall -W -Wextra -pedantic -Werror -pedantic-errors $(shell imlib2-config --cflags) -O3
 LDLIBS := $(shell imlib2-config --libs)
 PREFIX := /usr/local
 BINDIR := $(PREFIX)/bin

defines.h

@@ -20,7 +20,7 @@
 #define SSOCR2_DEFINES_H
 
 /* version number */
-#define VERSION "2.13.2"
+#define VERSION "2.13.3"
 
 /* states */
 #define FIND_DARK 0

ssocr.c

@@ -1004,7 +1004,7 @@ int main(int argc, char **argv)
     int middle=0, quarter=0, three_quarters=0; /* scanlines */
     int d_height=0; /* height of digit */
     /* if digits[d].digit == D_ONE do nothing */
-    if((digits[d].digit == D_UNKNOWN)) {
+    if(digits[d].digit == D_UNKNOWN) {
       int third=1; /* in which third we are */
       int half;
       found_pixels=0; /* how many pixels are already found */