http://benji3up2kxewkqfcq7buxk2xd6zwy3zggnurkrm3l4cvwy2iipvyyad.onion/mirrors/gmpdoc/Notes-for-Particular-Systems.html
Note that the FreeBSD package system installs
GNU m4 under the name ‘ gm4 ’, which GMP cannot guess. FreeBSD 7.x, 8.x, 9.x ¶ GMP releases starting with 6.0 do not support ‘ ABI=32 ’ on FreeBSD/amd64
prior to release 10.0 of the system. The cause is a broken limits.h ,
which GMP no longer works around.