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-rw-r--r--Build/source/configure.ac9
1 files changed, 9 insertions, 0 deletions
diff --git a/Build/source/configure.ac b/Build/source/configure.ac
index 78a7468c6e9..efa596b0f7e 100644
--- a/Build/source/configure.ac
+++ b/Build/source/configure.ac
@@ -14,6 +14,15 @@ AC_CONFIG_SRCDIR([m4/kpse-pkgs.m4])
AC_CONFIG_AUX_DIR([build-aux])
AC_CONFIG_MACRO_DIR([m4])
+dnl Prevent to configure the source tree by mistake.
+if test "x$srcdir" = x. && test "x$enable_build_in_source_tree" != xyes; then
+ rm -rf config.log
+ AC_MSG_ERROR([Configuring and building TeX Live in the source tree
+is strongly discouraged. If you really want to do that, you must
+specify the configure option `--enable-build-in-source-tree', but
+then do not ask for help -- you have been warned.])
+fi
+
dnl ## ------------------------------------------- ##
dnl ## Setup of the TeX Live (TL) infrastructure ##
dnl ## done in ./, libs/, utils/, and texk/ ##