[MacPorts] #63396: dvisvgm-2.12 (clipper.cpp) fails to be built with /usr/include/c++/v1/cmath

[MacPorts]

#63396: dvisvgm-2.12 (clipper.cpp) fails to be built with /usr/include/c++/v1/cmath
---------------------------+--------------------------
 Reporter:  ShugoSUWAZONO  |      Owner:  (none)
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:  2.7.1
 Keywords:                 |       Port:  dvisvgm-2.12
---------------------------+--------------------------
 /usr/bin/clang++ -std=gnu++11 -DHAVE_CONFIG_H -I. -I../..
 -I/opt/local/include
 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk -Wall -pipe
 -Os -stdlib=libc++
 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk -arch
 x86_64 -Wno-mismatched-tags -MT clipper.o -MD -MP -MF $depbase.Tpo -c -o
 clipper.o clipper.cpp &&\
 mv -f $depbase.Tpo $depbase.Po
 In file included from clipper.cpp:42:
 /Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk/usr/include/c++/v1/cmath:321:9:
 error: no member named 'signbit' in the global namespace
 using ::signbit;
        ~~^

 ...similar error continues for ::fpclassify, ::isfinite, ::isinf, ::isnan,
 ::isnormal, ::isgreater, ::isgreat, ...

 13 errors generated.

-- 
Ticket URL: <https://trac.macports.org/ticket/63396>
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