From 5e865d80297d371eaa9538d791a0cab730d874a4 Mon Sep 17 00:00:00 2001
From: Nick Gasson <nick@nickg.me.uk>
Date: Sat, 17 Jun 2023 21:13:21 +0100
Subject: [PATCH] Parallel make by default only when explicitly requested.
 Fixes #716

---
 configure.ac | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 514a3a83..0373866d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -447,14 +447,24 @@ AM_CONDITIONAL([ENABLE_BASH_COMPLETION],
 AX_CHECK_GNU_MAKE
 if test x$_cv_have_gnu_make = xyes ; then
   MAKEFLAGS='$(if $(V),,-s)'
+fi
+AC_SUBST(MAKEFLAGS)
 
+AC_ARG_ENABLE([parallel_make],
+              [AS_HELP_STRING([--enable-parallel-make],
+                              [Enable make -j by default])],
+              [parallel_make=$enableval],
+              [parallel_make=no])
+
+# Build with make -j by default but only if requested
+PARALLEL_MAKEFLAGS=
+if test x$parallel_make = xyes; then
   AC_MSG_CHECKING([whether to enable parallel make by default])
   AX_COMPARE_VERSION([$ax_check_gnu_make_version], [ge], [4,0],
                      [AC_MSG_RESULT([yes])
                       PARALLEL_MAKEFLAGS="-j"],
                      [AC_MSG_RESULT([no])])
 fi
-AC_SUBST(MAKEFLAGS)
 AC_SUBST(PARALLEL_MAKEFLAGS)
 
 # Optional code coverage statistics
-- 
2.39.2