diff --git a/srcpkgs/mame/patches/ppc-long_double.patch b/srcpkgs/mame/patches/ppc-long_double.patch
new file mode 100644
index 0000000000..a01fa1000f
--- /dev/null
+++ b/srcpkgs/mame/patches/ppc-long_double.patch
@@ -0,0 +1,16 @@
+--- src/emu/xtal.h	2020-12-30 16:46:10.000000000 +0100
++++ src/emu/xtal.h	2020-12-31 13:41:51.679447004 +0100
+@@ -81,8 +81,13 @@
+ constexpr XTAL operator *(double       mult, const XTAL &xtal) { return XTAL(xtal.base(), mult * xtal.dvalue()); }
+ 
+ constexpr XTAL operator ""_Hz_XTAL(long double clock) { return XTAL(double(clock)); }
++#ifdef _GLIBCXX_LONG_DOUBLE_COMPAT
++constexpr XTAL operator ""_kHz_XTAL(long double clock) { return XTAL(double(clock) * 1e3); }
++constexpr XTAL operator ""_MHz_XTAL(long double clock) { return XTAL(double(clock) * 1e6); }
++#else
+ constexpr XTAL operator ""_kHz_XTAL(long double clock) { return XTAL(double(clock * 1e3)); }
+ constexpr XTAL operator ""_MHz_XTAL(long double clock) { return XTAL(double(clock * 1e6)); }
++#endif
+ 
+ constexpr XTAL operator ""_Hz_XTAL(unsigned long long clock) { return XTAL(double(clock)); }
+ constexpr XTAL operator ""_kHz_XTAL(unsigned long long clock) { return XTAL(double(clock) * 1e3); }