diff --git a/Common/CommandLine.cpp b/Common/CommandLine.cpp
index b62f8c3b568d2c5298980a08be807419c4d2eb35..654f25761f91f8bd37889fc04334f32158036c84 100644
--- a/Common/CommandLine.cpp
+++ b/Common/CommandLine.cpp
@@ -34,7 +34,7 @@
 #endif
 
 #if defined(HAVE_OCC)
-#include <Standard_Version.hxx>
+#include "Standard_Version.hxx"
 #endif
 
 #if defined(HAVE_POST)
@@ -929,13 +929,14 @@ void GetOptions(int argc, char *argv[])
                 FL_MINOR_VERSION, FL_PATCH_VERSION);
 #endif
 #if defined(HAVE_PETSC)
-        fprintf(stderr, "PETSc version    : %d.%d.%d\n", PETSC_VERSION_MAJOR,
-                PETSC_VERSION_MINOR, PETSC_VERSION_SUBMINOR);
+        fprintf(stderr, "PETSc version    : %d.%d.%d (%s arithmtic)\n", PETSC_VERSION_MAJOR,
+                PETSC_VERSION_MINOR, PETSC_VERSION_SUBMINOR,
 #if defined(PETSC_USE_COMPLEX)
-        fprintf(stderr, "PETSc arithmetic : Complex\n");
+                "complex"
 #else
-        fprintf(stderr, "PETSc arithmetic : Real\n");
+                "real"
 #endif
+                );
 #endif
 #if defined(HAVE_OCC)
         fprintf(stderr, "OCC version      : %d.%d.%d\n", OCC_VERSION_MAJOR,
diff --git a/Fltk/helpWindow.cpp b/Fltk/helpWindow.cpp
index 0d6fedc413e3f14a97eebae652898926c4a35e4b..b5bbc920a46007ea1859e4accec6a273e2030d2f 100644
--- a/Fltk/helpWindow.cpp
+++ b/Fltk/helpWindow.cpp
@@ -26,6 +26,10 @@
 #include "petsc.h"
 #endif
 
+#if defined(HAVE_OCC)
+#include "Standard_Version.hxx"
+#endif
+
 static const char *help_link(Fl_Widget *w, const char *uri)
 {
   fl_open_uri(uri);
@@ -309,10 +313,14 @@ helpWindow::helpWindow()
             << "<li><i>PETSc version:</i> " << PETSC_VERSION_MAJOR << "."
             << PETSC_VERSION_MINOR << "." << PETSC_VERSION_SUBMINOR
 #if defined(PETSC_USE_COMPLEX)
-            << "<li><i>PETSc arithmetic:</i> Complex"
+            << " (complex arithmetic)"
 #else
-            << "<li><i>PETSc arithmetic:</i> Real"
+            << " (real arithmetic)"
+#endif
 #endif
+#if defined(HAVE_OCC)
+            << "<li><i>OCC version:</i> " << OCC_VERSION_MAJOR << "."
+            << OCC_VERSION_MINOR << "." << OCC_VERSION_MAINTENANCE
 #endif
             << "<li><i>Packaged by:</i> " << GetGmshPackager()
             << "</ul>"