Compilation issue 2/3 <fontforge>/m4 argz.m4 symlink

Hello,

coming up-to-date with fontforge again after some years and I noticed a 
few compilation 'show-stoppers'. I am posting each issue in a separate 
mail for clarity.

System: Linux Mint 19.1 (based on Ubuntu bionic) with gcc/g++ 7.3.0, 
make 4.1, automake 1.15.1 (in case any of these is relevant).

Issue 2:

The sym link <fontforge_source_dir>/m4/argz.m4 points toward the system 
file /usr/share/aclocal/argz.m4 which, since several years, has been 
renamed into ltargz.m4.

Deleting the current sym link from the fontforge m4 subdir and setting a 
new sym link with:

ln -s /usr/share/aclocal/ltargz.m4 ltargz.m4

is enough to fix it, but the problem may not be obvious to the general 
user or he might not know which the new destination file name should be. 
If the file renaming is general, the code base should be updated or, if 
the renaming is depending on the distro, a note should be added in 
https://github.com/fontforge/fontforge/blob/master/INSTALL-git.md

Thank you,

MMG



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