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The new Linux ProcessInfo implementation uses two macros not readily available in NDK API versions older than 21 (Android 5.0.0): NT_PRSTATUS and PR_GETREGSET. Chrome uses API 21 for 64-bit builds, but uses API 16 for 32-bit builds. NT_PRSTATUS is normally defined by <elf.h> or by <linux/elf.h>, included by <elf.h>. Although the definition in <linux/elf.h> is available in older NDK API versions, this internal header does not mix well with <elf.h> unless <elf.h> contemplates this combination. As of NDK API 21, <elf.h> actually delegates most of its work to <linux/elf.h>. PR_GETREGSET is not available in the NDK at all until API 21. Its definition is in <linux/ptrace.h>. Most user code should #include <sys/ptrace.h> instead, which includes <linux/ptrace.h>. Bug: crashpad:30 Test: crashpad_util_test ProcessInfo.* Change-Id: I4d07a9964db4665a49bde490e905ae9126880bc5 Reviewed-on: https://chromium-review.googlesource.com/455659 Reviewed-by: Joshua Peraza <jperaza@chromium.org>