Fixed build issue with debian trixie

•  All references to Nix::, Nix.hpp, Nix.cpp, --no-nixgl, and nixGL in the built Hyprland sources are removed via assets/0002-start-hyprland-no-nixgl.patch.
◦  The patch:
▪  Drops the Nix include and logic from start/src/core/Instance.cpp, start/src/core/State.hpp, and start/src/main.cpp.
▪  Removes the --no-nixgl flag and the Nix environment checks.
▪  Makes start-hyprland exec Hyprland directly, with no nixGL wrapper or Nix environment inspection.

 On branch development
 Your branch is up to date with 'origin/development'.

 Changes to be committed:
	new file:   assets/0002-start-hyprland-no-nixgl.patch
	modified:   install-scripts/hyprland.sh

assets/0002-start-hyprland-no-nixgl.patch

@@ -0,0 +1,73 @@
+--- a/start/src/core/Instance.cpp
++++ b/start/src/core/Instance.cpp
+@@ -1,7 +1,6 @@
+ #include "Instance.hpp"
+ #include "State.hpp"
+ #include "../helpers/Logger.hpp"
+-#include "../helpers/Nix.hpp"
+ 
+ #include <cstdlib>
+ #include <cstring>
+@@ -55,12 +54,7 @@ void CHyprlandInstance::runHyprlandThread(bool safeMode) {
+ 		procctl(P_PID, getpid(), PROC_PDEATHSIG_CTL, &sig);
+ #endif
+ 
+-		if (Nix::shouldUseNixGL()) {
+-			argsStd.insert(argsStd.begin(), g_state->customPath.value_or("Hyprland"));
+-			args.insert(args.begin(), strdup(argsStd.front().c_str()));
+-			execvp("nixGL", args.data());
+-		} else
+-			execvp(g_state->customPath.value_or("Hyprland").c_str(), args.data());
++	execvp(g_state->customPath.value_or("Hyprland").c_str(), args.data());
+ 
+ 		g_logger->log(Hyprutils::CLI::LOG_ERR, "fork(): execvp failed: {}", strerror(errno));
+ 		std::fflush(stdout);
+--- a/start/src/core/State.hpp
++++ b/start/src/core/State.hpp
+@@ -8,7 +8,6 @@
+ struct SState {
+ 	std::span<const char*>     rawArgvNoBinPath;
+ 	std::optional<std::string> customPath;
+-	bool                       noNixGl = false;
+ };
+ 
+ inline UP<SState> g_state = makeUnique<SState>();
+--- a/start/src/main.cpp
++++ b/start/src/main.cpp
+@@ -3,7 +3,6 @@
+ #include <print>
+ 
+ #include "helpers/Logger.hpp"
+-#include "helpers/Nix.hpp"
+ #include "core/State.hpp"
+ #include "core/Instance.hpp"
+@@ -21,7 +20,6 @@ Any arguments after -- are passed to Hyprland. For Hyprland help, run start-hypr
+ 
+ Additional arguments for start-hyprland:
+  --path [path]       -> Override Hyprland path
+- --no-nixgl          -> Force disable nixGL
+ )#";
+@@ -76,7 +74,6 @@ int main(int argc, const char** argv, const char** envp) {
+ 			continue;
+ 		}
+ 		if (arg == "--no-nixgl") {
+-			g_state->noNixGl = true;
+ 			continue;
+ 		}
+ 	}
+@@ -87,15 +84,6 @@ int main(int argc, const char** argv, const char** envp) {
+ 	if (!g_state->rawArgvNoBinPath.empty())
+ 		g_logger->log(Hyprutils::CLI::LOG_WARN, "Arguments after -- are passed to Hyprland");
+ 
+-	// check if our environment is OK
+-	if (const auto RET = Nix::nixEnvironmentOk(); !RET) {
+-		g_logger->log(Hyprutils::CLI::LOG_ERR, "Nix environment check failed:\n{}", RET.error());
+-		return 1;
+-	}
+-
+-	if (Nix::shouldUseNixGL())
+-		g_logger->log(Hyprutils::CLI::LOG_DEBUG, "Hyprland was compiled with Nix - will use nixGL");
+-
+ 	bool safeMode = false;
+ 	while (true) {
+ 		g_instance     = makeUnique<CHyprlandInstance>();

install-scripts/hyprland.sh

@@ -139,6 +139,19 @@ EOF
             echo "${NOTE} Hyprland compile patch does not apply on $tag; skipping."
         fi
     fi
+
+    # Optionally strip nixGL/Nix helper logic from start-hyprland (Debian does not need it)
+    if [ -f "$PARENT_DIR/assets/0002-start-hyprland-no-nixgl.patch" ]; then
+        if patch -p1 --dry-run <"$PARENT_DIR/assets/0002-start-hyprland-no-nixgl.patch" >/dev/null 2>&1; then
+            patch -p1 <"$PARENT_DIR/assets/0002-start-hyprland-no-nixgl.patch"
+        else
+            echo "${NOTE} Hyprland start-hyprland nixGL patch does not apply on $tag; skipping."
+        fi
+    fi
+
+    # Remove Nix helper sources that are no longer used (defensive)
+    rm -f start/src/helpers/Nix.cpp start/src/helpers/Nix.hpp || true
+
     # By default, build Hyprland with bundled hyprutils/hyprlang to avoid version mismatches
     # You can force system libs by exporting USE_SYSTEM_HYPRLIBS=1 before running this script.
     USE_SYSTEM=${USE_SYSTEM_HYPRLIBS:-1}