@User Following up on your suggestion, I first used the "configure --without-opengl" option. This caused the configure script to omit checking for the GL headers, but had no effect on the make process - 'make' still reported the fatal errors due to GL header files not found. Then I looked at the configure script and found that there were options to point it to the locations of my GL include and library files. So this problem was solved on my mac by executing configure in this way: ./configure --x-includes=/opt/X11/include --x-libraries=/opt/X11/lib However, make now shows a new issue, barfing line after line of parsed functions it sees as invalid, like this: CmdSubrs.c4339: error: implicit declaration of function 'DBTechNameTypes' is invalid in C99 [-Werror,-Wimplicit-function-declaration] DBWdisplay.c6525: error: implicit declaration of function 'GrBox' is invalid in C99 [-Werror,-Wimplicit-function-declaration] DRCbasic.c10177: error: implicit declaration of function 'drcCheckOffGrid' is invalid in C99 [-Werror,-Wimplicit-function-declaration] EFargs.c2353: error: implicit declaration of function 'efSymAddFile' is invalid in C99 [-Werror,-Wimplicit-function-declaration] ...and so on, making a big log file. Not sure if this is a gcc issue that configure isn't catching in its testing. I tried "make -e" and "make -B" with no change in result. Any advice appreciated, thanks.