unlink executable file

i have mutiple files and different makefiles for each file. everytime when i compile, the different previous compiled file will be executed automatically. so right now, i have three files execute at same time, and i only need to compile one of them. does anyone knows how to unlink the executable file from newly made Makefile.

eg. i compiled and executed a.c, got all the output. when i compile b.c, the a is executed automatically.

[446 byte] By [alvinhonga] at [2007-11-27 3:33:46]