diff -up qtbase-opensource-src-5.9.1/config.tests/unix/ibase/ibase.cpp.firebird qtbase-opensource-src-5.9.1/config.tests/unix/ibase/ibase.cpp
--- qtbase-opensource-src-5.9.1/config.tests/unix/ibase/ibase.cpp.firebird	2017-06-28 04:54:29.000000000 -0500
+++ qtbase-opensource-src-5.9.1/config.tests/unix/ibase/ibase.cpp	2017-07-16 08:28:47.833992502 -0500
@@ -37,7 +37,7 @@
 **
 ****************************************************************************/
 
-#include <ibase.h>
+#include <firebird/ibase.h>
 
 int main(int, char **)
 {
diff -up qtbase-opensource-src-5.9.1/src/plugins/sqldrivers/configure.json.firebird qtbase-opensource-src-5.9.1/src/plugins/sqldrivers/configure.json
--- qtbase-opensource-src-5.9.1/src/plugins/sqldrivers/configure.json.firebird	2017-06-28 04:54:29.000000000 -0500
+++ qtbase-opensource-src-5.9.1/src/plugins/sqldrivers/configure.json	2017-07-16 12:38:43.730108724 -0500
@@ -50,7 +50,8 @@
             "test": "unix/ibase",
             "sources": [
                 { "libs": "-lgds32_ms", "condition": "config.win32" },
-                { "libs": "-lgds", "condition": "!config.win32" }
+                { "libs": "-lgds", "condition": "!config.win32" },
+                { "libs": "-lfbclient", "condition": "!config.win32" }
             ]
         },
         "mysql": {
diff -up qtbase-opensource-src-5.9.1/src/plugins/sqldrivers/ibase/qsql_ibase_p.h.firebird qtbase-opensource-src-5.9.1/src/plugins/sqldrivers/ibase/qsql_ibase_p.h
--- qtbase-opensource-src-5.9.1/src/plugins/sqldrivers/ibase/qsql_ibase_p.h.firebird	2017-06-28 04:54:29.000000000 -0500
+++ qtbase-opensource-src-5.9.1/src/plugins/sqldrivers/ibase/qsql_ibase_p.h	2017-07-16 08:28:47.833992502 -0500
@@ -52,7 +52,7 @@
 //
 
 #include <QtSql/qsqldriver.h>
-#include <ibase.h>
+#include <firebird/ibase.h>
 
 #ifdef QT_PLUGIN
 #define Q_EXPORT_SQLDRIVER_IBASE