https://bugs.gentoo.org/923959
https://github.com/OpenPrinting/libcupsfilters/issues/35
https://github.com/OpenPrinting/libcupsfilters/commit/668d7dac277c1d44732fc25e5491c79ff82e597d
--- a/cupsfilters/pdftoraster.cxx
+++ b/cupsfilters/pdftoraster.cxx
@@ -2198,7 +2198,11 @@
 // For compatibility with g++ >= 4.7 compilers _GLIBCXX_THROW
 // should be used as a guard, otherwise use traditional definition
 #ifndef _GLIBCXX_THROW
+#if __cplusplus < 201703L
 #define _GLIBCXX_THROW throw
+#else
+#define _GLIBCXX_THROW(...) noexcept(false)
+#endif
 #endif
 
 void * operator new(size_t size) _GLIBCXX_THROW (std::bad_alloc)