diff -urN abook-0.6.1.orig/database.c abook-0.6.1/database.c
--- abook-0.6.1.orig/database.c	2015-12-29 11:45:22.738615735 +0100
+++ abook-0.6.1/database.c	2015-12-29 11:45:56.615176646 +0100
@@ -859,7 +859,7 @@
  */
 
 /* quick lookup by "standard" field number */
-inline int
+int
 field_id(int i)
 {
 	assert((i >= 0) && (i < ITEM_FIELDS));
diff -urN abook-0.6.1.orig/database.h abook-0.6.1/database.h
--- abook-0.6.1.orig/database.h	2015-12-29 11:45:22.738615735 +0100
+++ abook-0.6.1/database.h	2015-12-29 11:45:48.475202058 +0100
@@ -61,7 +61,7 @@
 /*
  * Field operations
  */
-inline int field_id(int i);
+int field_id(int i);
 abook_field *find_standard_field(char *key, int do_declare);
 abook_field *real_find_field(char *key, abook_field_list *list, int *nb);
 #define find_field(key, list)		real_find_field(key, list, NULL)