How to include utilities from a GLSL file


what is the recommended method for requiring a file of GLSL functions in a vert or frag shader ?
I am using an vertex attributes shader similarly to the example _opengl/ParticleShpereGPU
The file that i wish to include has many utility functions for blending colors, ie, the PhotoshopMathFP one from here

GlslProg supports the #include statement. Check out the DeferredShadingAdvanced sample:

awesome thank you! that worked