PostgreSQL test can not pass when cross compiling

defineTest(qtConfTest_psqlCompile) {
    pg_config = $$config.input.psql_config
    isEmpty(pg_config): \
        pg_config = $$qtConfFindInPath("pg_config")
    !win32:!isEmpty(pg_config) {
        libdir = $$system("$$pg_config --libdir")
        libdir -= $$QMAKE_DEFAULT_LIBDIRS
        !isEmpty(libdir): libs = "-L$$libdir"
        libs += "-lpq"
        $${1}.libs = $$libs
        $${1}.includedir = $$system("$$pg_config --includedir")
        $${1}.includedir -= $$QMAKE_DEFAULT_INCDIRS
        !isEmpty($${1}.includedir): \
            $${1}.cflags = "-I$$eval($${1}.includedir)"
    }

    # Respect PSQL_LIBS if set
    PSQL_LIBS = $$getenv(PSQL_LIBS)
    !isEmpty($$PSQL_LIBS): $${1}.libs = $$PSQL_LIBS

    export($${1}.libs)
    export($${1}.includedir)
    export($${1}.cflags)

    qtConfTest_compile($${1}): return(true)
    return(false)
}