Update BuildingCrossDev.md

BuildingCrossDev.md

@@ -4,9 +4,22 @@ installing the cross development environment
 Built on OSX 10.11.3
 Notes: 
    * My /usr/local is writable by me. You will probable need to add "sudo" to any "make install" lines
-   * I have gcc-5.3.0 installed in /usr/local
+   * You can probably install most of this stuff using a package system rather than building from sources
 
-0. The fantastic AmigaOS cross compiler for Linux / MacOSX / Windows 
+0. gcc-5.3.0 for OSX
+    ```
+# svn checkout svn://gcc.gnu.org/svn/gcc/tags/gcc_5_3_0_release gcc-5.3.0-src
+# cd gcc-5.3.0-src
+# ./contrib/download_prerequisites
+# cd ..
+# mkdir gcc-5.3.0-build
+# cd gcc-5.3.0-build
+#  ../gcc-5.3.0-src/configure --prefix=/usr/local --enable-languages=c,c++
+# make -j4
+# make install
+```
+
+1. The fantastic AmigaOS cross compiler for Linux / MacOSX / Windows 
 
    https://github.com/cahirwpz/amigaos-cross-toolchain
 
@@ -16,7 +29,7 @@ Notes:
 # ./toolchain-m68k --prefix=/usr/local/amiga build
 ```
    
-1. autoconf
+2. autoconf
     ```
     # curl -OL http://ftpmirror.gnu.org/autoconf/autoconf-2.69.tar.gz
     # tar xzf autoconf-2.69.tar.gz
@@ -26,7 +39,7 @@ Notes:
     # make install
 ```
 
-2. automake
+3. automake
     ```
     # curl -OL http://ftpmirror.gnu.org/automake/automake-1.15.tar.gz
     # tar xzf automake-1.15.tar.gz
@@ -36,7 +49,7 @@ Notes:
     # make install
 ```
 
-3. pkg-config
+4. pkg-config
     ```
     # curl -OL https://pkg-config.freedesktop.org/releases/pkg-config-0.29.tar.gz
     # tar zxf pkg-config-0.29.tar.gz
@@ -46,7 +59,7 @@ Notes:
     # make install
 ```
 
-4. lha
+5. lha
     ```
     # git clone https://github.com/jca02266/lha.git
     # aclocal
@@ -58,7 +71,7 @@ Notes:
     # make install
 ```
 
-5. libtool
+6. libtool
     ```
    # wget http://ftpmirror.gnu.org/libtool/libtool-2.4.6.tar.gz
    # tar zxfv libtool-2.4.6.tar.gz
@@ -68,7 +81,7 @@ Notes:
    # make install
 ```
 
-6. libpng
+7. libpng
     ```
    # wget ftp://ftp.simplesystems.org/pub/png/src/libpng16/libpng-1.6.21.tar.gz
    # tar zxfv libpng-1.6.21.tar.gz
@@ -78,7 +91,7 @@ Notes:
    # make install
 ```
 
-7. pngquant
+8. pngquant
     ```
     # git clone git://github.com/pornel/pngquant.git
     # cd pngquant/lib