the tool tries to generate binary output, but the current locale might change
what awk generates.  force it to C/ASCII to avoid that.

https://bugs.gentoo.org/601012

--- a/test/pbmtext.test
+++ b/test/pbmtext.test
@@ -81,12 +81,14 @@ rm ${fontRectangle_txt} ${font_pbm}
 
 # One long row
 # Should print 3233136020 4535
+LC_CTYPE=C \
 awk 'BEGIN { for (i=32; i<=125;++i) printf("%c",i);
              for (i=160;i<=255;++i) printf("%c",i); }' | \
     pbmtext -builtin bdf | cksum
 
 # One tall column
 # Should print 1216262214 5711
+LC_CTYPE=C \
 awk 'BEGIN { for (i=32; i<=125;++i) printf("%c\n",i);
              for (i=160;i<=255;++i) printf("%c\n",i); }' | \
     pbmtext -nomargins -builtin bdf | cksum