I was searching too and i found


Change "info_pan" to name of your panel.

I am not sure if is the right way, but it works.
I know is boring but sometimes is better to make a search on 3DGS Manual.
Lesson of day

I hope it helps

I know those instructions (set,vecset), they color all Panel elements, but in case of text Panels are OK.
Thanks for help

This is the complete code for components panel color:

//Colored Panel Text
#include <acknex.h>
#include <default.c>
////////////////////////////////////////////////////////////////////

PANEL* first_pan =
{
digits (85, 620, "TEXT1","Arial#125b",1, 0 );
digits (650, 620, "TEXT2","Arial#125b",1, 0 );
flags = SHOW | OUTLINE;
}

/////////////////////////////////////////////////////////////////////

function main()
{
video_screen = 1;//full screen=1, default =2 windows mode
screen_size.x = 1024;
screen_size.y = 768;
set(first_pan,LIGHT); // modulate all panel bitmaps with the given color
vec_set(first_pan.blue,vector(0,255,0));//all panel components green color
//vec_set(first_pan.blue,vector(0,0,255));//all panel components red color
//vec_set(first_pan.blue,vector(255,0,0)); //all panel components blue color
}