Fix build for Debian Stable

src/Makefile.in

@@ -1101,7 +1101,7 @@ libaudacity_la_SOURCES = \
 	xml/XMLTagHandler.h \
 	$(NULL)
 
-audacity_CPPFLAGS = -Wno-deprecated-declarations \
+audacity_CPPFLAGS = -std=c++11 -Wno-deprecated-declarations \
 	-D__STDC_CONSTANT_MACROS -DLIBDIR=\"$(libdir)\" \
 	$(EXPAT_CFLAGS) $(FILEDIALOG_CFLAGS) $(PORTAUDIO_CFLAGS) \
 	$(PORTMIXER_CFLAGS) $(SNDFILE_CFLAGS) $(SOXR_CFLAGS) \

src/Mix.cpp

@@ -763,7 +763,7 @@ void Mixer::Reposition(double t)
 
 void Mixer::SetTimesAndSpeed(double t0, double t1, double speed)
 {
-   wxASSERT(isfinite(speed));
+   wxASSERT(std::isfinite(speed));
    mT0 = t0;
    mT1 = t1;
    mSpeed = fabs(speed);