Summary

Fixes compilation error when building Linux snap packages that use the desktop_drop plugin. The error occurred because std::getenv was used without the proper header include.

Error Details

When building a snap with snapcraft --use-lxd, the build failed with:

/root/parts/desktop-drop-example/build/linux/flutter/ephemeral/.plugin_symlinks/desktop_drop/linux/desktop_drop_plugin.cc:69:29: error: no member named 'getenv' in namespace 'std'; did you mean simply 'getenv'?

Root Cause

The code was calling std::getenv("XDG_CURRENT_DESKTOP") without including <cstdlib> or <stdlib.h>, which provide the getenv function. While this might work in some build environments due to transitive includes, snap builds with stricter compilation flags exposed this missing dependency.

Solution

• Added #include <stdlib.h> to provide access to the getenv function
• Changed std::getenv to getenv for consistency with other C functions used in the same file (like strcmp, g_ascii_strdown, etc.)

Changes Made

 #include <flutter_linux/flutter_linux.h>
 #include <gtk/gtk.h>
+#include <stdlib.h>
 #include <sys/utsname.h>

 ...

 static void desktop_drop_plugin_init(DesktopDropPlugin *self) {
-  const char * desktopEnv = std::getenv("XDG_CURRENT_DESKTOP");
+  const char * desktopEnv = getenv("XDG_CURRENT_DESKTOP");
   if (desktopEnv) {

Testing

• Verified the fix compiles correctly with standard gcc
• Tested getenv functionality works as expected
• No behavioral changes - only fixes the compilation issue

Fixes #424.

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