Download the source code from:

git clone https://github.com/wjaguar/mtPaint.git

Load the following dependence:

gtk2-dev.tcz
libpng-dev.tcz
lcms2-dev.tcz
openjpeg2-dev.tcz
giflib7-dev.tcz
libtiff-dev.tcz
libwebp1-dev.tcz

gettext-dev.tcz #for locale ony


CC="gcc -march=i486 -mtune=i686 -Os -pipe" CXX="g++ -march=i486 -mtune=i686 -Os -pipe -fno-exceptions -fno-rtti" ./configure realease man intl jpeg jp2v2 tiff webp lcms2

make 

sudo make install