add_compile_definitions(_USE_MATH_DEFINES)

CMakeLists.txt

@@ -10,8 +10,8 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DJSON_IS_AMALGAMATION")
 
 # Add math defines
-if (WIN32)
-    add_definitions(-D_USE_MATH_DEFINES)
+if(WIN32)
+  add_compile_definitions(_USE_MATH_DEFINES)
 endif()
 
 # Make the scripts available in the 'cmake' directory available for the
@@ -411,8 +411,8 @@ set_package_properties(LAPACK PROPERTIES
 )
 
 # Check if spatial solver is requested by user
-if (BUILD_SPATIAL_SOLVER)
-  if( NOT ENABLE_LAPACK)
+if(BUILD_SPATIAL_SOLVER)
+  if(NOT ENABLE_LAPACK)
     message(FATAL_ERROR "LAPACK is required to build spatial solvers.")
   endif()