AC_CHECK_HEADERS(unistd.h)
GINAC_HAVE_RUSAGE
GINAC_READLINE
-dnl Python is necessary for building function.{cpp,h}
-AC_PATH_PROG(PYTHON, python, "")
-AS_IF([test -z "$PYTHON" -a ! -f "$srcdir/ginac/function.cpp"],
- [AC_MSG_ERROR([GiNaC will not compile because Python is missing])])
+dnl Python3 is necessary for building function.{cpp,h}
+AC_PATH_PROG(PYTHON3, python3, "")
+AS_IF([test -z "$PYTHON3" -a ! -f "$srcdir/ginac/function.cpp"],
+ [AC_MSG_ERROR([GiNaC will not compile because Python3 is missing])])
dnl Check for dl library (needed for GiNaC::compile).
GINAC_EXCOMPILER