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enable_language(C)
# First call
find_package(GTK2 REQUIRED)
# Backup variables
set(GTK2_LIBRARIES_BAK ${GTK2_LIBRARIES})
set(GTK2_TARGETS_BAK ${GTK2_TARGETS})
# Second call
find_package(GTK2 REQUIRED)
# Check variables
if(NOT "${GTK2_LIBRARIES_BAK}" STREQUAL "${GTK2_LIBRARIES}")
message(SEND_ERROR "GTK2_LIBRARIES is different:\nbefore: ${GTK2_LIBRARIES_BAK}\nafter: ${GTK2_LIBRARIES}")
endif()
if(NOT "${GTK2_TARGETS_BAK}" STREQUAL "${GTK2_TARGETS}")
message(SEND_ERROR "GTK2_TARGETS is different:\nbefore: ${GTK2_TARGETS_BAK}\nafter: ${GTK2_TARGETS}")
endif()