/usr/share/qt4/mkspecs/features/lex.prf is in qt4-qmake 4:4.8.1-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Lex extra-compiler for handling files specified in the LEXSOURCES variable
#
{
lex.name = Lex ${QMAKE_FILE_IN}
lex.input = LEXSOURCES
lex_included {
lex.CONFIG += no_link
} else {
lex.variable_out = GENERATED_SOURCES
}
isEmpty(QMAKE_LEXFLAGS_MANGLE):QMAKE_LEXFLAGS_MANGLE = -P${QMAKE_FILE_BASE}
QMAKE_LEXEXTRAFLAGS = $$QMAKE_LEXFLAGS
!yacc_no_name_mangle:QMAKE_LEXEXTRAFLAGS += $$QMAKE_LEXFLAGS_MANGLE
lex.commands = $$QMAKE_LEX $$QMAKE_LEXEXTRAFLAGS ${QMAKE_FILE_IN}$$escape_expand(\\n\\t) \
$$QMAKE_DEL_FILE $${QMAKE_CPP_MOD_MOC}${QMAKE_FILE_BASE}_lex$${first(QMAKE_EXT_CPP)}$$escape_expand(\\n\\t) \
$$QMAKE_MOVE lex.${QMAKE_FILE_BASE}.c $${QMAKE_CPP_MOD_MOC}${QMAKE_FILE_BASE}_lex$${first(QMAKE_EXT_CPP)}$$escape_expand(\\n\\t)
lex.output = $${QMAKE_CPP_MOD_MOC}${QMAKE_FILE_BASE}_lex$${first(QMAKE_EXT_CPP)}
silent:lex.commands = @echo Lex ${QMAKE_FILE_IN} && $$lex.commands
QMAKE_EXTRA_COMPILERS += lex
}
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