https://git.ruby-lang.org/ruby.git/commit/?id=06c3e80611

From 06c3e80611b81ec8f251957328486e9b6dd18d3b Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Fri, 13 Aug 2021 08:16:24 -0700
Subject: Do not allow configuration where neither static or shared library is
 installed

Fixes [Bug #18000]
---
 configure.ac | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index fc9a9967f3..e581d9ae12 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3678,7 +3678,10 @@ AC_SUBST(MJIT_SUPPORT) https://github.com/ruby/ruby/blob/trunk/configure.ac#L3678
 
 AC_ARG_ENABLE(install-static-library,
 	AS_HELP_STRING([--disable-install-static-library], [do not install static ruby library]),
-	[INSTALL_STATIC_LIBRARY=$enableval],
+	[INSTALL_STATIC_LIBRARY=$enableval
+         AS_IF([test x"$enable_shared" = xno -a x"$INSTALL_STATIC_LIBRARY" = xno],
+                 [AC_MSG_ERROR([must install either static or shared library])],
+                 [])],
 	AS_IF([test x"$enable_shared" = xyes],
 	    [INSTALL_STATIC_LIBRARY=no],
 	    [INSTALL_STATIC_LIBRARY=yes]))
-- 
cgit v1.2.1


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