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diff -ruN OpenCV-2.2.0.orig/CMakeLists.txt OpenCV-2.2.0/CMakeLists.txt
--- OpenCV-2.2.0.orig/CMakeLists.txt 2011-07-13 21:49:54.474595691 +0200
+++ OpenCV-2.2.0/CMakeLists.txt 2011-07-13 21:51:01.917595716 +0200
@@ -196,10 +196,30 @@
# ----------------------------------------------------------------------------
# CHECK FOR SYSTEM LIBRARIES, OPTIONS, ETC..
# ----------------------------------------------------------------------------
+find_package(PkgConfig REQUIRED)
+
+if(BLAS_LIBRARIES)
+ include(CheckFortranFunctionExists)
+ set(CMAKE_REQUIRED_LIBRARIES ${BLAS_LIBRARIES})
+ CHECK_FORTRAN_FUNCTION_EXISTS("dgemm" BLAS_FOUND)
+ unset( CMAKE_REQUIRED_LIBRARIES )
+ if(BLAS_FOUND)
+ message(STATUS "BLAS supplied by user is WORKING, will use ${BLAS_LIBRARIES}.")
+ else(BLAS_FOUND)
+ message(FATAL_ERROR "BLAS supplied by user is not WORKING, CANNOT USE ${BLAS_LIBRARIES}.")
+ endif(BLAS_FOUND)
+else(BLAS_LIBRARIES)
+ # User did not provide a BLAS Library
+ pkg_check_modules(BLAS blas)
+endif (BLAS_LIBRARIES)
+
+if(NOT BLAS_FOUND)
+ message(FATAL_ERROR "BLAS libraries not found.")
+endif(NOT BLAS_FOUND)
+
find_package(LAPACK REQUIRED)
-find_package(BLAS REQUIRED)
find_package(ZLIB REQUIRED)
-find_package(PkgConfig REQUIRED)
+
pkg_check_modules(FLANN REQUIRED flann)
# Build/install (or not) some apps:
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