diff --git a/include/psyc/text.h b/include/psyc/text.h
index a94dd3b..a09d3fb 100644
--- a/include/psyc/text.h
+++ b/include/psyc/text.h
@@ -64,7 +64,7 @@ typedef struct
  * PSYC_TEXT_VALUE_NOT_FOUND if no match found in which case psyc_text
  * leaves the original template text as is.
  */
-typedef psycTextValueRC (*psycTextCB)(const char *name, size_t len, psycString *value);
+typedef psycTextValueRC (*psycTextCB)(const char *name, size_t len, psycString *value, void *extra);
 
 /**
  * Initializes the PSYC text state struct.
@@ -158,7 +158,7 @@ size_t psyc_getTextBytesWritten (psycTextState *state)
  *
  * @see http://about.psyc.eu/psyctext
  **/
-psycTextRC psyc_text (psycTextState *state, psycTextCB getValue);
+psycTextRC psyc_text (psycTextState *state, psycTextCB getValue, void *extra);
 
 /** @} */ // end of text group
 
diff --git a/lib/Makefile b/lib/Makefile
index fa8114a..62f7a85 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -2,7 +2,7 @@ prefix = /usr
 libdir = ${prefix}/lib
 
 INSTALL = install
-LIBS = libpsyc.a
+LIBS = libpsyc.a libpsyc.so
 
 install: ${LIBS}
 
@@ -10,7 +10,7 @@ libdir:
 	${INSTALL} -d ${libdir}
 
 ${LIBS}: libdir
-	${INSTALL} $@ ${libdir}
+	-${INSTALL} $@ ${libdir}
 
 clean:
 	rm -f ${LIBS}
diff --git a/src/text.c b/src/text.c
index c4a5fea..944dd41 100644
--- a/src/text.c
+++ b/src/text.c
@@ -1,7 +1,7 @@
 #include "lib.h"
 #include <psyc/text.h>
 
-psycTextRC psyc_text (psycTextState *state, psycTextCB getValue)
+psycTextRC psyc_text (psycTextState *state, psycTextCB getValue, void* extra)
 {
 	const char *start = state->tmpl.ptr, *end; // start & end of variable name
 	const char *prev = state->tmpl.ptr + state->cursor;
@@ -35,7 +35,7 @@ psycTextRC psyc_text (psycTextState *state, psycTextCB getValue)
 			continue; // [] is invalid, name can't be empty
 		}
 
-		ret = getValue(start + state->open.length, end - start - state->open.length, &value);
+		ret = getValue(start + state->open.length, end - start - state->open.length, &value, extra);
 
 		if (ret < 0)
 			continue; // value not found, no substitution
diff --git a/test/testText.c b/test/testText.c
index 21f732d..5f667f5 100644
--- a/test/testText.c
+++ b/test/testText.c
@@ -7,7 +7,7 @@
 
 uint8_t verbose;
 
-psycTextValueRC getValueFooBar (const char *name, size_t len, psycString *value)
+psycTextValueRC getValueFooBar (const char *name, size_t len, psycString *value, void *extra)
 {
 	if (verbose)
 		printf("> getValue: %.*s\n", (int)len, name);
@@ -16,7 +16,7 @@ psycTextValueRC getValueFooBar (const char *name, size_t len, psycString *value)
 	return PSYC_TEXT_VALUE_FOUND;
 }
 
-psycTextValueRC getValueEmpty (const char *name, size_t len, psycString *value)
+psycTextValueRC getValueEmpty (const char *name, size_t len, psycString *value, void *extra)
 {
 	if (verbose)
 		printf("> getValue: %.*s\n", (int)len, name);
@@ -25,7 +25,7 @@ psycTextValueRC getValueEmpty (const char *name, size_t len, psycString *value)
 	return PSYC_TEXT_VALUE_FOUND;
 }
 
-psycTextValueRC getValueNotFound (const char *name, size_t len, psycString *value)
+psycTextValueRC getValueNotFound (const char *name, size_t len, psycString *value, void *extra)
 {
 	if (verbose)
 		printf("> getValue: %.*s\n", (int)len, name);
@@ -41,7 +41,7 @@ int testText (char *template, size_t tmplen, char *buffer, size_t buflen, psycSt
 	psyc_initTextState(&state, template, tmplen, buffer, buflen);
 	do
 	{
-		ret = psyc_text(&state, getValue);
+		ret = psyc_text(&state, getValue, NULL);
 		length += psyc_getTextBytesWritten(&state);
 		switch (ret)
 		{