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AX_WITH_PROG([VARIABLE],[program],[VALUE-IF-NOT-FOUND],[PATH])
Locates an installed program binary, placing the result in the precious variable VARIABLE. Accepts a present VARIABLE, then --with-program, and failing that searches for program in the given path (which defaults to the system path). If program is found, VARIABLE is set to the full path of the binary; if it is not found VARIABLE is set to VALUE-IF-NOT-FOUND if provided, unchanged otherwise.
A typical example could be the following one:
AX_WITH_PROG(PERL,perl)
NOTE: This macro is based upon the original AX_WITH_PYTHON macro from Dustin J. Mitchell <dustin@cs.uchicago.edu>.
Francesco Salvestrini <salvestrini@users.sourceforge.net> and Dustin J. Mitchell <dustin@cs.uchicago.edu>.
2008-05-05
AC_DEFUN([AX_WITH_PROG],[ AC_PREREQ([2.61]) pushdef([VARIABLE],$1) pushdef([EXECUTABLE],$2) pushdef([VALUE_IF_NOT_FOUND],$3) pushdef([PATH_PROG],$4) AC_ARG_VAR(VARIABLE,Absolute path to EXECUTABLE executable) AS_IF(test -z "$VARIABLE",[ AC_MSG_CHECKING(whether EXECUTABLE executable path has been provided) AC_ARG_WITH(EXECUTABLE,AS_HELP_STRING([--with-EXECUTABLE=[[[[PATH]]]]],absolute path to EXECUTABLE executable), [ AS_IF([test "$withval" != "yes"],[ VARIABLE="$withval" AC_MSG_RESULT($VARIABLE) ],[ VARIABLE="" AC_MSG_RESULT([no]) ]) ],[ AC_MSG_RESULT([no]) ]) AS_IF(test -z "$VARIABLE",[ AC_PATH_PROG([]VARIABLE[],[]EXECUTABLE[],[]VALUE_IF_NOT_FOUND[],[]PATH_PROG[]) ]) ]) popdef([PATH_PROG]) popdef([VALUE_IF_NOT_FOUND]) popdef([EXECUTABLE]) popdef([VARIABLE]) ])
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