* Introduce make targets btest (build tests), blas (build blas lib), demos (build demos).
* remove EIGEN_BUILD_TESTS and siblings
* add summary at the end of cmake run, hopefully not too verbose
* fix build of quaternion demo
* kill remnants of old binary library option

demos/CMakeLists.txt

diff --git a/demos/CMakeLists.txt b/demos/CMakeLists.txt
index 4e8f516..1ec49d1 100644
--- a/demos/CMakeLists.txt
+++ b/demos/CMakeLists.txt
@@ -1,3 +1,9 @@
+add_custom_target(demos)
 
-add_subdirectory(mandelbrot)
-add_subdirectory(opengl)
+find_package(Qt4)
+if(QT4_FOUND)
+  add_subdirectory(mandelbrot)
+  add_subdirectory(opengl)
+else(QT4_FOUND)
+  message(STATUS "Qt4 not found, so disabling the mandelbrot and opengl demos")
+endif(QT4_FOUND)

demos/mandelbrot/CMakeLists.txt

diff --git a/demos/mandelbrot/CMakeLists.txt b/demos/mandelbrot/CMakeLists.txt
index d34b60a..5c500e0 100644
--- a/demos/mandelbrot/CMakeLists.txt
+++ b/demos/mandelbrot/CMakeLists.txt
@@ -16,5 +16,6 @@
 qt4_automoc(${mandelbrot_SRCS})
 
 add_executable(mandelbrot ${mandelbrot_SRCS})
+add_dependencies(demos mandelbrot)
 
 target_link_libraries(mandelbrot ${QT_QTCORE_LIBRARY} ${QT_QTGUI_LIBRARY})

demos/mix_eigen_and_c/README

diff --git a/demos/mix_eigen_and_c/README b/demos/mix_eigen_and_c/README
index d543f8d..21dba86 100644
--- a/demos/mix_eigen_and_c/README
+++ b/demos/mix_eigen_and_c/README
@@ -1,7 +1,9 @@
+This is an example of how one can wrap some of Eigen into a C library.
+
 To try this with GCC, do:
 
   g++ -c binary_library.cpp -O2 -msse2 -I ../..
   gcc example.c binary_library.o -o example -lstdc++
   ./example
 
-This is an example of how one can wrap some of Eigen into a C library.
+TODO: add CMakeLists, add more explanations here
\ No newline at end of file

demos/opengl/CMakeLists.txt

diff --git a/demos/opengl/CMakeLists.txt b/demos/opengl/CMakeLists.txt
index 968ed6c..b98a30c 100644
--- a/demos/opengl/CMakeLists.txt
+++ b/demos/opengl/CMakeLists.txt
@@ -1,4 +1,3 @@
-
 find_package(Qt4 REQUIRED)
 find_package(OpenGL REQUIRED)
 
@@ -14,6 +13,7 @@
 qt4_automoc(${quaternion_demo_SRCS})
 
 add_executable(quaternion_demo ${quaternion_demo_SRCS})
+add_dependencies(demos quaternion_demo)
 
 target_link_libraries(quaternion_demo
   ${QT_QTCORE_LIBRARY}    ${QT_QTGUI_LIBRARY}

demos/opengl/camera.cpp

diff --git a/demos/opengl/camera.cpp b/demos/opengl/camera.cpp
index a785caf..2659852 100644
--- a/demos/opengl/camera.cpp
+++ b/demos/opengl/camera.cpp
@@ -260,7 +260,7 @@
 
 Vector3f Camera::unProject(const Vector2f& uv, float depth) const
 {
-    Matrix4f inv = mViewMatrix.inverse();
+    Matrix4f inv = mViewMatrix.inverse().matrix();
     return unProject(uv, depth, inv);
 }