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-rw-r--r--configure.ac4
1 files changed, 4 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index efa32c4..0b2b816 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,6 +8,10 @@ AM_INIT_AUTOMAKE
AC_CONFIG_SRCDIR([config.h.in])
AC_CONFIG_HEADER([config.h])
+# Define a string for binary compatibility
+LIBPINYIN_BINARY_VERSION=0.3
+AC_SUBST(LIBPINYIN_BINARY_VERSION)
+
# Checks for programs.
AC_PROG_CXX
AC_PROG_CC