cmake HAVE_ISBLANK examples

moneymanagerex/moneymanagerex 3rd/CMakeLists.txt :182

target_compile_definitions(SQLite3
        PRIVATE
            NOPCH
            SQLITE_CORE
            SQLITE_ENABLE_FTS5
            SQLITE_ENABLE_EXTFUNC
            SQLITE_ENABLE_COLUMN_METADATA
            SQLITE_ENABLE_JSON1
            HAVE_ACOSH
            HAVE_ASINH
            HAVE_ATANH
            HAVE_ISBLANK
        PUBLIC
            SQLITE_HAS_CODEC
            CODEC_TYPE=CODEC_TYPE_AES128
            WXSQLITE3_USE_SQLCIPHER_LEGACY)

FujiNetWIFI/fujinet-firmware components_pc/libssh/ConfigureChecks.cmake :181

check_function_exists(isblank HAVE_ISBLANK)