diff --git a/git-gui.sh b/git-gui.sh
index d238d45238..c1a6b84fa4 100755
--- a/git-gui.sh
+++ b/git-gui.sh
@@ -59,7 +59,7 @@ if {$idx ne {}} {
 } else {
 	set auto_path [concat [list $oguilib] $auto_path]
 }
-unset -nocomplain oguilib oguirel idx fd
+unset -nocomplain oguirel idx fd
 
 if {![catch {set _verbose $env(GITGUI_VERBOSE)}]} {
 	unset _verbose
diff --git a/lib/option.tcl b/lib/option.tcl
index e06aca59f3..9f76f0294e 100644
--- a/lib/option.tcl
+++ b/lib/option.tcl
@@ -52,7 +52,7 @@ proc save_config {} {
 }
 
 proc do_about {} {
-	global appvers copyright
+	global appvers copyright oguilib
 	global tcl_patchLevel tk_patchLevel
 
 	set w .about_dialog
@@ -91,6 +91,10 @@ $copyright" \
 		append v ", Tk version $tk_patchLevel"
 	}
 
+	set d {}
+	append d "git exec dir: [gitexec]\n"
+	append d "git-gui lib: $oguilib"
+
 	label $w.vers \
 		-text $v \
 		-padx 5 -pady 5 \
@@ -100,6 +104,15 @@ $copyright" \
 		-relief solid
 	pack $w.vers -side top -fill x -padx 5 -pady 5
 
+	label $w.dirs \
+		-text $d \
+		-padx 5 -pady 5 \
+		-justify left \
+		-anchor w \
+		-borderwidth 1 \
+		-relief solid
+	pack $w.dirs -side top -fill x -padx 5 -pady 5
+
 	menu $w.ctxm -tearoff 0
 	$w.ctxm add command \
 		-label {Copy} \