diff --git a/include/trio.h b/include/trio.h
index 2c7c7b5..79c4fff 100644
--- a/include/trio.h
+++ b/include/trio.h
@@ -8,6 +8,8 @@
 #include "tr/interface/reader.h"
 #include "tr/interface/writer.h"
 
+const char * const TR_io_version(void);
+
 #endif // __TR_IO_H__
 
 // vim: set ts=4 sw=4:
diff --git a/src/Makefile.am b/src/Makefile.am
index 128ce11..c66867a 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,8 +1,8 @@
 ACLOCAL_AMFLAGS = -I m4
 AUTOMAKE_OPTIONS = subdir-objects
 
-AM_CFLAGS += -I../include/ -std=c99 -DREENTRANT -lpthread
-AM_LDFLAGS += -lpthread
+AM_CFLAGS += -I../include/ -std=c99
+AM_LDFLAGS +=
 
 TRIO = stream.c \
        read.c \
@@ -18,6 +18,7 @@ TRIO = stream.c \
        tcp_socket.c \
        udp_socket.c \
        remote_data.c \
+       version.c \
        i_socket.c \
        i_reader.c \
        i_writer.c
diff --git a/src/version.c b/src/version.c
new file mode 100644
index 0000000..3b814d6
--- /dev/null
+++ b/src/version.c
@@ -0,0 +1,7 @@
+#include "config.h"
+
+const char * const
+TR_io_version(void)
+{
+	return VERSION;
+}