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/usr/lib/x86_64-linux-gnu/libQt5SerialPort.prl is in libqt5serialport5-dev 5.2.1-1.

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QMAKE_PRL_BUILD_DIR = /build/buildd/qtserialport-opensource-src-5.2.1/src/serialport
QMAKE_PRO_INPUT = serialport.pro
QMAKE_PRL_TARGET = libQt5SerialPort.so.5.2.1
QMAKE_PRL_CONFIG = lex yacc depend_includepath testcase_targets import_plugins import_qpa_plugin qt warn_on release link_prl incremental gdb_dwarf_index shared qpa no_mocdepend release qt_no_framework linux unix posix gcc compile_examples system-sqlite qpa largefile nostrip precompile_header sse2 sse3 ssse3 sse4_1 sse4_2 avx avx2 pcre use_libmysqlclient_r prefix_build force_independent create_prl link_prl prepare_docs qt_docs_targets no_private_qt_headers_warning QTDIR_build no_dll exceptions_off testcase_exceptions need_fwd_pri qt_install_module qt_install_headers qmake_cache target_qt create_cmake create_pc create_libtool explicitlib c++11 hide_symbols bsymbolic_functions have_target dll thread moc resources
QMAKE_PRL_VERSION = 5.2.1
QMAKE_PRL_LIBS = -ludev -lQt5Core -lpthread