cmake-utils.eclass: check for ninja with ROOT=/

Gentoo-bug: 577244

diff --git a/eclass/cmake-utils.eclass b/eclass/cmake-utils.eclass
index 5f7bb8162d19162628fd19a3ef62a7576f9e933a..ebcb631b2dd3afda36c4653b05f4b8c23d4dd433 100644 (file)
--- a/eclass/cmake-utils.eclass
+++ b/eclass/cmake-utils.eclass
@@ -242,7 +242,7 @@ _cmake_generator_to_use() {
                ninja)
                        # if ninja is enabled but not installed, the build could fail
                        # this could happen if ninja is manually enabled (eg. make.conf) but not installed
-                       if ! has_version dev-util/ninja; then
+                       if ! ROOT=/ has_version dev-util/ninja; then
                                die "CMAKE_MAKEFILE_GENERATOR is set to ninja, but ninja is not installed. Please install dev-util/ninja or unset CMAKE_MAKEFILE_GENERATOR."
                        fi
                        generator_name="Ninja"