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Android API level 22 and earlier don't provide any complex-valued math functions in complex.h,
which are required for complex data type support in CXSparse.
--- a/CXSparse/CMakeLists.txt
+++ b/CXSparse/CMakeLists.txt
@@ -45,7 +45,7 @@
# MS Visual Studio does not support the complex type for ANSI C11.
# FIXME: see GraphBLAS for how to use complex types in MS Visual Studio.
-if ( MSVC OR ("${CMAKE_C_SIMULATE_ID}" STREQUAL "MSVC") )
+if ( MSVC OR CMAKE_C_SIMULATE_ID STREQUAL "MSVC" OR (CMAKE_SYSTEM_NAME STREQUAL "Android" AND CMAKE_SYSTEM_VERSION VERSION_LESS 23) )
option ( CXSPARSE_USE_COMPLEX "ON: complex data type enabled. OFF (default): complex data type disabled." OFF )
else ( )
option ( CXSPARSE_USE_COMPLEX "ON (default): complex data type enabled. OFF: complex data type disabled." ON )
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