diff --git a/src/posix/sdl/crashcatcher.c b/src/posix/sdl/crashcatcher.c
index be0e8f599..e52e7f3c1 100644
--- a/src/posix/sdl/crashcatcher.c
+++ b/src/posix/sdl/crashcatcher.c
@@ -366,9 +366,7 @@ static void crash_handler(const char *logfile)
 		const char *str;
 		char buf[512];
 
-		if((str=getenv("KDE_FULL_SESSION")) && strcmp(str, "true") == 0)
-			snprintf(buf, sizeof(buf), "kdialog --title \"Very Fatal Error\" --textbox \"%s\" 800 600", logfile);
-		else if((str=getenv("GNOME_DESKTOP_SESSION_ID")) && str[0] != '\0')
+		if((str=getenv("GNOME_DESKTOP_SESSION_ID")) && str[0] != '\0')
 			snprintf(buf, sizeof(buf), "gxmessage -buttons \"Okay:0\" -geometry 800x600 -title \"Very Fatal Error\" -center -file \"%s\"", logfile);
 		else
 			snprintf(buf, sizeof(buf), "xmessage -buttons \"Okay:0\" -center -file \"%s\"", logfile);
diff --git a/src/posix/sdl/i_system.cpp b/src/posix/sdl/i_system.cpp
index f96d15686..f70bd7587 100644
--- a/src/posix/sdl/i_system.cpp
+++ b/src/posix/sdl/i_system.cpp
@@ -113,16 +113,9 @@ void Linux_I_FatalError(const char* errortext)
 	// Close window or exit fullscreen and release mouse capture
 	SDL_Quit();
 
-	const char *str;
-	if((str=getenv("KDE_FULL_SESSION")) && strcmp(str, "true") == 0)
-	{
-		FString cmd;
-		cmd << "kdialog --title \"" GAMENAME " " << GetVersionString()
-			<< "\" --msgbox \"" << errortext << "\"";
-		popen(cmd, "r");
-	}
+
 #ifndef NO_GTK
-	else if (I_GtkAvailable())
+	if (I_GtkAvailable())
 	{
 		I_ShowFatalError_Gtk(errortext);
 	}
@@ -196,59 +189,6 @@ int I_PickIWad (WadStuff *wads, int numwads, bool showwin, int defaultiwad)
 		return defaultiwad;
 	}
 
-#ifndef __APPLE__
-	const char *str;
-	if((str=getenv("KDE_FULL_SESSION")) && strcmp(str, "true") == 0)
-	{
-		FString cmd("kdialog --title \"" GAMENAME " ");
-		cmd << GetVersionString() << ": Select an IWAD to use\""
-					" --menu \"" GAMENAME " found more than one IWAD\n"
-					"Select from the list below to determine which one to use:\"";
-
-		for(i = 0; i < numwads; ++i)
-		{
-			const char *filepart = strrchr(wads[i].Path, '/');
-			if(filepart == NULL)
-				filepart = wads[i].Path;
-			else
-				filepart++;
-			// Menu entries are specified in "tag" "item" pairs, where when a
-			// particular item is selected (and the Okay button clicked), its
-			// corresponding tag is printed to stdout for identification.
-			cmd.AppendFormat(" \"%d\" \"%s (%s)\"", i, wads[i].Name.GetChars(), filepart);
-		}
-
-		if(defaultiwad >= 0 && defaultiwad < numwads)
-		{
-			const char *filepart = strrchr(wads[defaultiwad].Path, '/');
-			if(filepart == NULL)
-				filepart = wads[defaultiwad].Path;
-			else
-				filepart++;
-			cmd.AppendFormat(" --default \"%s (%s)\"", wads[defaultiwad].Name.GetChars(), filepart);
-		}
-
-		FILE *f = popen(cmd, "r");
-		if(f != NULL)
-		{
-			char gotstr[16];
-
-			if(fgets(gotstr, sizeof(gotstr), f) == NULL ||
-			   sscanf(gotstr, "%d", &i) != 1)
-				i = -1;
-
-			// Exit status = 1 means the selection was canceled (either by
-			// Cancel/Esc or the X button), not that there was an error running
-			// the program. In that case, nothing was printed so fgets will
-			// have failed. Other values can indicate an error running the app,
-			// so fall back to whatever else can be used.
-			int status = pclose(f);
-			if(WIFEXITED(status) && (WEXITSTATUS(status) == 0 || WEXITSTATUS(status) == 1))
-				return i;
-		}
-	}
-#endif
-
 #ifndef NO_GTK
 	if (I_GtkAvailable())
 	{