Autoconf check for program and fail if not found

Question

I\'m creating a project and using GNU Autoconf tools to do the configuring and making. I\'ve set up all my library checking and header file checking but can\'t seem to figure ou

Answer 1

When using AC_CHECK_PROG, this is the most concise version that I've run across is:

AC_CHECK_PROG(BOGUS,[bogus],[bogus],[no])
test "$BOGUS" == "no" && AC_MSG_ERROR([Required program 'bogus' not found.])

When the program is missing, this output will be generated:

./configure
...cut...
checking for bogus... no
configure: error: Required program 'bogus' not found.

Or when coupled with the built-in autoconf program checks, use this instead:

AC_PROG_YACC
AC_PROG_LEX

test "$YACC" == ":" && AC_MSG_ERROR([Required program 'bison' not found.])
test "$LEX" == ":" && AC_MSG_ERROR([Required program 'flex' not found.])