This is a semi-automatic report based on the latest archive rebuild results [1].
Apologies if it reaches you in error.
Excerpt from the buildlog:
make[1]: Leaving directory `/build/buildd/structure-synth-1.5.0'
touch config-stamp
dh_testdir
qmake-qt4 -project \
-after "CONFIG+=opengl" -after "QT+=xml opengl script"
qmake-qt4
/usr/bin/make \
CFLAGS="-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -DDATADIR=\\\"/usr/share/structure-synth\\\"" \
CXXFLAGS="-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -DDATADIR=\\\"/usr/share/structure-synth\\\"" \
LFLAGS="-Wl,-z,defs -Wl,-as-needed -Wl,--no-undefined" \
TARGET="structure-synth"
make[1]: Entering directory `/build/buildd/structure-synth-1.5.0'
g++ -c -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -DDATADIR=\"/usr/share/structure-synth\" -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtOpenGL -I/usr/include/qt4/QtXml -I/usr/include/qt4/QtScript -I/usr/include/qt4 -I. -IStructureSynth/GUI -ISyntopiaCore/GLEngine -ISyntopiaCore/Math -ISyntopiaCore/Misc -IStructureSynth/Parser -ISyntopiaCore/Exceptions -IStructureSynth/Model/Rendering -IStructureSynth/Model -IThirdPartyCode/MersenneTwister -ISyntopiaCore/Logging -IStructureSynth/JavaScriptSupport -ISyntopiaCore/GLEngine/Raytracer -I/usr/X11R6/include -I. -o Main.o Main.cpp
g++ -c -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -DDATADIR=\"/usr/share/structure-synth\" -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtOpenGL -I/usr/include/qt4/QtXml -I/usr/include/qt4/QtScript -I/usr/include/qt4 -I. -IStructureSynth/GUI -ISyntopiaCore/GLEngine -ISyntopiaCore/Math -ISyntopiaCore/Misc -IStructureSynth/Parser -ISyntopiaCore/Exceptions -IStructureSynth/Model/Rendering -IStructureSynth/Model -IThirdPartyCode/MersenneTwister -ISyntopiaCore/Logging -IStructureSynth/JavaScriptSupport -ISyntopiaCore/GLEngine/Raytracer -I/usr/X11R6/include -I. -o MainWindow.o StructureSynth/GUI/MainWindow.cpp
g++ -c -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -DDATADIR=\"/usr/share/structure-synth\" -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtOpenGL -I/usr/include/qt4/QtXml -I/usr/include/qt4/QtScript -I/usr/include/qt4 -I. -IStructureSynth/GUI -ISyntopiaCore/GLEngine -ISyntopiaCore/Math -ISyntopiaCore/Misc -IStructureSynth/Parser -ISyntopiaCore/Exceptions -IStructureSynth/Model/Rendering -IStructureSynth/Model -IThirdPartyCode/MersenneTwister -ISyntopiaCore/Logging -IStructureSynth/JavaScriptSupport -ISyntopiaCore/GLEngine/Raytracer -I/usr/X11R6/include -I. -o TemplateExportDialog.o StructureSynth/GUI/TemplateExportDialog.cpp
g++ -c -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -DDATADIR=\"/usr/share/structure-synth\" -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtOpenGL -I/usr/include/qt4/QtXml -I/usr/include/qt4/QtScript -I/usr/include/qt4 -I. -IStructureSynth/GUI -ISyntopiaCore/GLEngine -ISyntopiaCore/Math -ISyntopiaCore/Misc -IStructureSynth/Parser -ISyntopiaCore/Exceptions -IStructureSynth/Model/Rendering -IStructureSynth/Model -IThirdPartyCode/MersenneTwister -ISyntopiaCore/Logging -IStructureSynth/JavaScriptSupport -ISyntopiaCore/GLEngine/Raytracer -I/usr/X11R6/include -I. -o VariableEditor.o StructureSynth/GUI/VariableEditor.cpp
g++ -c -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -DDATADIR=\"/usr/share/structure-synth\" -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtOpenGL -I/usr/include/qt4/QtXml -I/usr/include/qt4/QtScript -I/usr/include/qt4 -I. -IStructureSynth/GUI -ISyntopiaCore/GLEngine -ISyntopiaCore/Math -ISyntopiaCore/Misc -IStructureSynth/Parser -ISyntopiaCore/Exceptions -IStructureSynth/Model/Rendering -IStructureSynth/Model -IThirdPartyCode/MersenneTwister -ISyntopiaCore/Logging -IStructureSynth/JavaScriptSupport -ISyntopiaCore/GLEngine/Raytracer -I/usr/X11R6/include -I. -o Debug.o StructureSynth/JavaScriptSupport/Debug.cpp
In file included from StructureSynth/JavaScriptSupport/Debug.cpp:16:0:
StructureSynth/JavaScriptSupport/../../SyntopiaCore/GLEngine/Sphere.h:25:4: error: 'GLUquadric' does not name a type
make[1]: *** [Debug.o] Error 1
make[1]: Leaving directory `/build/buildd/structure-synth-1.5.0'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
******************************************************************************
Build finished at 20120211-1125
FAILED [dpkg-buildpackage died]
The full buidlog can be found at https://launchpad.net/ubuntu/+archive/test-rebuild-20120201/+build/3172153/+files/buildlog_ubuntu-precise-i386.structure-synth_1.5.0-1_FAILEDTOBUILD.txt.gz.
[1] http://people.ubuntuwire.org/~wgrant/rebuild-ftbfs-test/test-rebuild-20120201-precise.html
Fixed in quantal by way of a sync from Debian. See the linked Debian bug.