Workaround another oddity in (very) recent versions of autoconf.
Problem found by the Debian autobuilders, in the pcp-gui build but it
affects pcp too. Latest versions of autoconf evaluate AC_PROG_LEX in
the compiler check macro, and complete remove any trace of AC_PROG_LEX
from its original callsite. This results in a syntax error inside our
configure script, as we call it within if ... fi, which then evaluates
to having no body to the if. Ugh. Fix is trivial though, since these
macros do the user-env-variable expansion thing already.
Workaround another oddity in (very) recent versions of autoconf.
Problem found by the Debian autobuilders, in the pcp-gui build but it
affects pcp too. Latest versions of autoconf evaluate AC_PROG_LEX in
the compiler check macro, and complete remove any trace of AC_PROG_LEX
from its original callsite. This results in a syntax error inside our
configure script, as we call it within if ... fi, which then evaluates
to having no body to the if. Ugh. Fix is trivial though, since these
macros do the user-env-variable expansion thing already.