ag_check_pathfind

Not all systems have pathfind(3). See if we need to substitute. To make this work, you have to do horrible things. See the doc for AG_CHECK_STRCSPN.

AC_DEFUN([AG_CHECK_PATHFIND],[
  AC_MSG_CHECKING([whether pathfind(3) works])
  AC_CACHE_VAL([ag_cv_pathfind],[
  AC_TRY_RUN([#include <string.h>
#include <stdlib.h>
int main (int argc, char** argv) {
   char* pz = pathfind( getenv( "PATH" ), "sh", "x" );
   return (pz == 0) ? 1 : 0;
}],[ag_cv_pathfind=yes],[ag_cv_pathfind=no],[ag_cv_pathfind=no]
  ) # end of TRY_RUN]) # end of CACHE_VAL

  AC_MSG_RESULT([$ag_cv_pathfind])
  if test x$ag_cv_pathfind = xyes
  then
    AC_DEFINE(HAVE_PATHFIND, 1,
       [Define this if pathfind(3) works])
  else
    if test x$ac_cv_lib_gen_pathfind = xyes
    then :
    else
      COMPATOBJ="$COMPATOBJ pathfind.lo"
    fi
  fi
]) # end of AC_DEFUN of AG_CHECK_PATHFIND

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