configure.ac: check $AR for ar to use

Resolves #1705. Tested against https://github.com/NixOS/nixpkgs/pull/242350.

diff --git a/configure.ac b/configure.ac
index 61f42589e9884b9ae2a6e41fe991ad2b6fc855bb..743b4743804bf5e2e316931f6982ebbb0a895a7e 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -33,6 +33,7 @@ esac
 # Checks for programs.
 AC_PROG_CC
 AC_PROG_CXX
+AC_CHECK_TOOL(AR, ar, :)
 AC_PROG_INSTALL
 
 PKG_PROG_PKG_CONFIG([0.9.0])