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Fix build with older pkg-config versions
The PKG_CHECK_VAR macro was introduced in pkg-config 0.28. Guard the invocation with m4_ifdef. Fixes #374.
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@ -1226,7 +1226,8 @@ else
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[have_libicu=no])
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if test "x$have_libicu" = "xyes"; then
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PKG_CHECK_VAR([ICU_DEFS], [icu-i18n], [DEFS])
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m4_ifdef([PKG_CHECK_VAR],
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[PKG_CHECK_VAR([ICU_DEFS], [icu-i18n], [DEFS])])
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if test "x$ICU_DEFS" != "x"; then
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CPPFLAGS="$CPPFLAGS $ICU_DEFS"
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fi
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