gentoo-overlay/dev-util/ltrace/files/ltrace-0.7.1-libunwind-pkgconfig.patch

--- ltrace-0.7.1/configure.ac
+++ ltrace-0.7.1/configure.ac
@@ -154,26 +154,10 @@
 AC_MSG_RESULT([$enable_libunwind])
 
 if test x"$enable_libunwind" = xyes; then
-  saved_LDFLAGS="${LDFLAGS}"
-  LDFLAGS="${LDFLAGS} ${AM_LDFLAGS}"
-  AC_CHECK_LIB(unwind, backtrace, libunwind_LIBS=-lunwind, libunwind_LIBS=)
-  AC_SUBST(libunwind_LIBS)
-  AC_CHECK_LIB(unwind-ptrace, _UPT_create, libunwind_ptrace_LIBS=-lunwind-ptrace, libunwind_ptrace_LIBS=)
-  AC_SUBST(libunwind_ptrace_LIBS)
-
-  case "${host_cpu}" in
-      arm*|sa110)         UNWIND_ARCH="arm" ;;
-      i?86)               UNWIND_ARCH="x86" ;;
-      powerpc)            UNWIND_ARCH="ppc32" ;;
-      ppc64)              UNWIND_ARCH="ppc64" ;;
-      mips*)              UNWIND_ARCH="mips" ;;
-      *)                  UNWIND_ARCH="${host_cpu}" ;;
-  esac
-
-  AC_CHECK_LIB(unwind-${UNWIND_ARCH}, _U${UNWIND_ARCH}_init_remote, libunwind_arch_LIBS=-lunwind-${UNWIND_ARCH}, libunwind_arch_LIBS=)
-  AC_SUBST(libunwind_arch_LIBS)
+  PKG_CHECK_MODULES([libunwind], [libunwind-generic])
+  PKG_CHECK_MODULES([libunwind_ptrace], [libunwind-ptrace])
+  PKG_CHECK_MODULES([libunwind_arch], [libunwind])
   AC_DEFINE([HAVE_LIBUNWIND], [1], [we have libunwind])
-  LDFLAGS="${saved_LDFLAGS}"
 fi