etmc/tmLQCD — pull request #96 by kostrzewa (2012-03-23 09:08:06+00:00)
Title: make configure fail if (F)LEX is not found

we need to fail if (f)lex is not found because otherwise, if read_input.c already exists and read_input.l changes, read_input.c will not be rebuilt in a sort of silent manner with only a warning in the build log

this situation can occur if one obtains a source tree which has been compiled once from someone else and one tries to modify read_input.l, only to find that read_input.c is not being updated silently, even though it is clearly a target with correct dependencies in the Makefile