Documentation compilation fails with Ghostscript v9.50 (Ubuntu 20.04)
Example:
Current allocation mode is local
Current file position is 8386
GPL Ghostscript 9.50: Unrecoverable error, exit code 1
Generating image form_5.png for formula
Error: /undefined in getenv
Operand stack:
(outfile)
Execution stack:
%interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- false 1 %stopped_push 1990 1 4 %oparray_pop 1989 1 4 %oparray_pop 1977 1 4 %oparray_pop 1833 1 4 %oparray_pop --nostringval-- %errorexec_pop .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval--
Dictionary stack:
--dict:731/1123(ro)(G)-- --dict:0/20(G)-- --dict:76/200(L)-- --dict:5/30(L)-- --dict:11/30(L)--