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Needed to fix build on ppc + musl. Doesn't seem to yet be in upstream gnulib.
https://www.openwall.com/lists/musl/2017/11/05/2
https://github.com/void-linux/void-packages/blob/master/srcpkgs/grep/patches/ppc-musl.patch
--- a/lib/sigsegv.c
+++ b/lib/sigsegv.c
@@ -221,8 +221,10 @@ int libsigsegv_version = LIBSIGSEGV_VERSION;
/* both should be equivalent */
# if 0
# define SIGSEGV_FAULT_STACKPOINTER ((ucontext_t *) ucp)->uc_mcontext.regs->gpr[1]
-# else
+# elif defined(__GLIBC__)
# define SIGSEGV_FAULT_STACKPOINTER ((ucontext_t *) ucp)->uc_mcontext.uc_regs->gregs[1]
+# else
+# define SIGSEGV_FAULT_STACKPOINTER ((ucontext_t *) ucp)->uc_mcontext.gregs[1]
# endif
# endif
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