library not found for -lQt5Concurrent - macos

I'm a complete newb when it comes to compiled languages, I'm a web developer. But I need to build a C++ library.
I'm using OSX 10.9 with homebrew. The library's dependancies are Qt5, openCV, openBR... I managed to get that all running. Installed Qt5.2 beta from the official page, I built openCV and openBR myself from sources.
Now this final application throws this, when I try to make it:
ld: library not found for -lQt5Concurrent
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [libfacedet.dylib] Error 1
make[1]: *** [CMakeFiles/facedet.dir/all] Error 2
make: *** [all] Error 2
What the hell is lQt5Concurrent? There's no such lib installed on my system. I tried to find it, the only files that have concurrent in their name are header files in Qt's directory
/Users/ellmo/Qt5.2.0/5.2.0-beta1/clang_64/lib/QtConcurrent.framework/Versions/5/Headers/qtconcurrent_global.h
/Users/ellmo/Qt5.2.0/5.2.0-beta1/clang_64/lib/QtConcurrent.framework/Versions/5/Headers/qtconcurrentcompilertest.h
/Users/ellmo/Qt5.2.0/5.2.0-beta1/clang_64/lib/QtConcurrent.framework/Versions/5/Headers/qtconcurrentexception.h
/Users/ellmo/Qt5.2.0/5.2.0-beta1/clang_64/lib/QtConcurrent.framework/Versions/5/Headers/qtconcurrentfilter.h
/Users/ellmo/Qt5.2.0/5.2.0-beta1/clang_64/lib/QtConcurrent.framework/Versions/5/Headers/qtconcurrentfilterkernel.h
/Users/ellmo/Qt5.2.0/5.2.0-beta1/clang_64/lib/QtConcurrent.framework/Versions/5/Headers/qtconcurrentfunctionwrappers.h
/Users/ellmo/Qt5.2.0/5.2.0-beta1/clang_64/lib/QtConcurrent.framework/Versions/5/Headers/qtconcurrentiteratekernel.h
/Users/ellmo/Qt5.2.0/5.2.0-beta1/clang_64/lib/QtConcurrent.framework/Versions/5/Headers/qtconcurrentmap.h
/Users/ellmo/Qt5.2.0/5.2.0-beta1/clang_64/lib/QtConcurrent.framework/Versions/5/Headers/qtconcurrentmapkernel.h
/Users/ellmo/Qt5.2.0/5.2.0-beta1/clang_64/lib/QtConcurrent.framework/Versions/5/Headers/qtconcurrentmedian.h
/Users/ellmo/Qt5.2.0/5.2.0-beta1/clang_64/lib/QtConcurrent.framework/Versions/5/Headers/qtconcurrentreducekernel.h
/Users/ellmo/Qt5.2.0/5.2.0-beta1/clang_64/lib/QtConcurrent.framework/Versions/5/Headers/qtconcurrentrun.h
/Users/ellmo/Qt5.2.0/5.2.0-beta1/clang_64/lib/QtConcurrent.framework/Versions/5/Headers/qtconcurrentrunbase.h
/Users/ellmo/Qt5.2.0/5.2.0-beta1/clang_64/lib/QtConcurrent.framework/Versions/5/Headers/qtconcurrentstoredfunctioncall.h
/Users/ellmo/Qt5.2.0/5.2.0-beta1/clang_64/lib/QtConcurrent.framework/Versions/5/Headers/qtconcurrentthreadengine.h
/Users/ellmo/Qt5.2.0/5.2.0-beta1/clang_64/lib/QtConcurrent.framework/Versions/5/Headers/qtconcurrentversion.h
I have no idea how to get the proper Qt5 devlibs and where to link them.
The author of the application in question cannot help me, as he has no experience with OSX. He said he built this with no problem on Ubuntu.
I also don't think I can show you much of the code, as the application is proprietary.
Please help.

A suggestion from http://qt-project.org/forums/viewthread/22998
In your .pro file, add: LIBS += -lQt5Concurrent
There are a few other suggestions at that link as well, but I believe the one I mention is all I had to do.

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I'm trying to install the ivtools vector graphics editor (http://ivtools.sourceforge.net/ivtools/index.html) on macOS big sur. I'm trying to build it from source and I keep running into the issue below
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Not finding the libIV library probably means this library was not successfully built. If it had built successfully you would see these files:
./src/IV-common/DARWIN/libIV-common.dylib
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make: * [all] Error 2
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I've been trying to link the GDAL library to qt-creator this last week, but have been having problems compiling the library in order to correctly link it.
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Had the same problem. Solved it by by:
compiling ZLib,
placing zlib1.dll in MinGW/bin,
placing libz.a and libz.dll.a in MinGW/lib.

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configure.exe --qtdir=C:\QtSDK\Desktop\Qt\4.7.3\mingw
The response is:
Configuring Qt Cryptographic Architecture (QCA) ...
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from c:\qtsdk\mingw\bin\../lib/gcc/mingw32/4.4.0/../../../../include/ole2.h:9,
from c:\qtsdk\mingw\bin\../lib/gcc/mingw32/4.4.0/../../../../include/windows.h:114,
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mingw32-make[1]: *** [release] Error 2
mingw32-make: *** [sub-src-make_default] Error 2
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The "native" (i.e.: MSVCRT dependent)
port of make is lacking in some
functionality and has modified
functionality due to the lack of POSIX
on Win32.
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I've been for the past few hours trying to figure out why openCV doesn't compile on leopard. I've been googling for references but all point to a dead google group.
So my question is quite simple: I've read INSTALL file, read all documentation i could find and still couldn't figure a solution for this.
The compile breaks here (this is generated through the Makefile):
rm -fr
.libs/libcxcore.lax/lib_cxcore.a mkdir
.libs/libcxcore.lax/lib_cxcore.a
Extracting /Users/fmsf/Projects/Motion
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&& ar x /Users/fmsf/Projects/Motion
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such file or directory make[2]: ***
[libcxcore.la] Error 1 make[1]: ***
[check-recursive] Error 1 make: ***
[check-recursive] Error 1
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I'm using mac os 1.5 leopard, while reading i found the full port for Mac OS is still unfinished, but I don't really believe it's the missing of this library.
Based on the error, my suggestion is:
Try building it in a folder that doesn't have spaces in the name.
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you may be trying 1.1. this is pretty new. consider trying 1.0. i have built 1.0 on windows and ubuntu.

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