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There are several questions on SO regarding how to create a pre-build step for qmake , I can do that with this in my .pro file: versionTarget.target = ../VersionData/versioning.h versionTarget.depends = FORCE win32: versionTarget.commands = cd $$PWD; python.exe ./version_getter.py -p $$TARGET else: versionTarget.commands = cd $$PWD; python ./version_getter.py -p $$TARGET PRE_TARGETDEPS += ../VersionData/versioning.h QMAKE_EXTRA_TARGETS += versionTarget Now, the problem is that this approach is not a build step per se but just another build target, so if I have the -j flag configured for make it runs my script in parallel with the other build jobs. This is very bad, because my script creates/updates a header file - having it change part way through the compilation is not acceptable. So, is there anyway I can have this script executed before any compilation is ran? I know I can create another script and call the version_getter.py and qmake in sequence from that, but this is not desirable as I would have to compile from the command line rather than from within Qt Creator. Update The complete .pri file that is included by every one of my sub-projects is below: CONFIG += thread QT += core \ gui versionTarget.target = ../VersionData/versioning.h versionTarget.depends = FORCE win32: versionTarget.commands = cd $$PWD; python.exe ./version_getter.py -p $$TARGET else: versionTarget.commands = cd $$PWD; python ./version_getter.py -p $$TARGET PRE_TARGETDEPS += ../VersionData/versioning.h QMAKE_EXTRA_TARGETS += versionTarget DEPENDPATH += ../VersionData INCLUDEPATH += ../VersionData HEADERS += ../VersionData/versioning.h UI_HEADERS_DIR = $${_PRO_FILE_PWD_}/include/Qui DESTDIR = $(SYREN_PATH) !win32-msvc { QMAKE_CXXFLAGS += -std=c++0x } But this still r

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