commit d2090cd10aa89ace0eaa75969a10b5d53a0da0f7
author Keir Mierle <mierle@gmail.com> Wed Feb 21 15:57:01 2018 -0800
committer Sameer Agarwal <sameeragarwal@google.com> Thu Feb 22 15:11:03 2018 +0000
tree 9428e842614b3517ac52e2d30bbc2beb222e2974
parent 27789c0d96d871c3f5e076dc1ad529375b43cd89

Improve NDK build error handling

Change-Id: I1dd51d8c5d3b8eef829f60a72c8c869e18b64830

jni/Android.mk

diff --git a/jni/Android.mk b/jni/Android.mk
index 4ddcdf8..f959ea8 100644
--- a/jni/Android.mk
+++ b/jni/Android.mk
@@ -79,6 +79,11 @@
   $(error Ceres requires NDK version r9d or greater)
 endif
 
+# Ceres requires Eigen to build.
+ifndef EIGEN_PATH
+  $(error Ceres requires Eigen; please invoke via EIGEN_PATH=... ndk-build)
+endif
+
 EIGEN_PATH := $(EIGEN_PATH)
 CERES_INCLUDE_PATHS := $(CERES_EXTRA_INCLUDES)
 CERES_INCLUDE_PATHS += $(LOCAL_PATH)/../internal