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diff -up firefox-60.5.0/memory/build/mozjemalloc.cpp.jemalloc-ppc firefox-60.5.0/memory/build/mozjemalloc.cpp
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--- firefox-60.5.0/memory/build/mozjemalloc.cpp.jemalloc-ppc	2019-01-22 10:25:30.764207480 +0100
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+++ firefox-60.5.0/memory/build/mozjemalloc.cpp	2019-01-22 10:28:48.352235343 +0100
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@@ -180,7 +180,7 @@ using namespace mozilla;
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 // Debug builds are opted out too, for test coverage.
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 #ifndef MOZ_DEBUG
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 #if !defined(__ia64__) && !defined(__sparc__) && !defined(__mips__) && \
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-    !defined(__aarch64__)
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+    !defined(__aarch64__) && !defined(__powerpc__)
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 #define MALLOC_STATIC_PAGESIZE 1
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 #endif
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 #endif