Create patch

• diff -ruN path/to/original.file patch/to/changed.file > patch.patch
• Open resulting patch and change header ** --- a/path/file.extension ** +++ b/path/file.extension

PKGBUILD changes

• Add to source array
• Add to checksum array ('SKIP')
• Add applying of patch to build()/prepare() ** patch -p1 -i ../patch.patch

Also add package to /etc/pacman.conf -> IgnorePkg directive, as otherwise it gets overwritten during update