--- /dev/null
+Currently fails to build with
+
+../../dom/media/webaudio/Unified_cpp_dom_media_webaudio1.o: In function `mozilla::FFTBlock::InterpolateFrequencyComponents(mozilla::FFTBlock const&, mozilla::FFTBlock const&, double)':
+Unified_cpp_dom_media_webaudio1.cpp:(.text+0x2238): undefined reference to `__c99_cabs'
+Unified_cpp_dom_media_webaudio1.cpp:(.text+0x224d): undefined reference to `__c99_cabs'
+../../dom/media/webaudio/Unified_cpp_dom_media_webaudio1.o: In function `mozilla::FFTBlock::AddConstantGroupDelay(double)':
+Unified_cpp_dom_media_webaudio1.cpp:(.text+0x2562): undefined reference to `__c99_cabs'
+../../dom/media/webaudio/Unified_cpp_dom_media_webaudio1.o: In function `mozilla::FFTBlock::ExtractAverageGroupDelay()':
+Unified_cpp_dom_media_webaudio1.cpp:(.text+0x26b9): undefined reference to `__c99_cabs'
+../../dom/media/webaudio/blink/Unified_cpp_webaudio_blink0.o: In function `WebCore::Biquad::setZeroPolePairs(std::complex<double> const&, std::complex<double> const&)':
+Unified_cpp_webaudio_blink0.cpp:(.text+0x1261): undefined reference to `__c99_cabs'
+../../dom/media/webaudio/blink/Unified_cpp_webaudio_blink0.o:Unified_cpp_webaudio_blink0.cpp:(.text+0x1292): more undefined references to `__c99_cabs' follow
+/scratch/wip/firefox-hg/work/mozilla/config/rules.mk:809: recipe for target 'libxul.so' failed
+
+NetBSD-7.99.26/amd64/20160321