error when compling motif
 

I am trying to compile motif 2.3.8 on RHEL 7.7.
The compilation stops with the following error:

libtool: link: gcc -g -O2 -Wall -g -fno-strict-aliasing -Wno-unused -Wno-comment -fno-tree-ter -I/usr/include/freetype2 -I/usr/include/uuid -I/usr/include/libpng15 -o wmluiltok wmluiltok.o -lXp -lfontconfig -lfreetype -lXft -ljpeg -lpng
/usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
make[2]: *** [wmluiltok] Error 1

Has anybody else faced this error and how did you solve it?

I'd have a closer look at wmluiltok.o. It's this file that should define main. You could use nm to list the symbols, but there might be other tools that accomplish that.

Perhaps remove wmluiltok.o and restart the make? Or remove it and run make wmluiltok.o?

Do you need to compile it yourself?
On my distro, openmotif 2.3.8 is in the repos.

I added the following line at the top of wmluiltok.l
%option main

It solved the problem.

# yum install motif-devel
... will install motif version 2.3.4 ...

Fedora 31 still has version 2.3.4 : Seven patches required to build.
And fourteen patches are used to build the CentOS 7.7 motif.

Some OS, e.g. Debian Sid has a motif 2.3.8 : 17 patches → http://deb.debian.org/debian/pool/ma....debian.tar.xz

Motif `BuildRequires:´ for CentOS 7.7 →
automake libtool autoconf flex flex-devel flex-static byacc pkgconfig libjpeg-devel libpng-devel libXft-devel, libXmu-devel libXp-devel libXt-devel libXext-devel xorg-x11-xbitmaps perl

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Interesting.
I noticed that someone else installed flex on the server this morning. I don't know if this solved my error or if it was the fix I posted in this thread. Anyway, motif-2.3.8 is successfully built now.