fixed build issues

.devcontainer/devcontainer.json

@@ -0,0 +1,23 @@
+{
+    "name": "Signal Server C/C++ Development",
+    "dockerFile": "../Dockerfile",
+    "workspaceFolder": "/workspace",
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "ms-vscode.cpptools-extension-pack",
+                "ms-vscode.cmake-tools",
+                "xaver.clang-format",
+                "ms-vscode.makefile-tools"
+            ],
+            "settings": {
+                "C_Cpp.default.cppStandard": "c++17",
+                "C_Cpp.default.cStandard": "c11",
+                "C_Cpp.default.compilerPath": "/usr/bin/g++",
+                "C_Cpp.default.intelliSenseMode": "linux-gcc-x64"
+            }
+        }
+    },
+    "postCreateCommand": "cd src && make clean",
+    "remoteUser": "root"
+}

Dockerfile

@@ -0,0 +1,28 @@
+FROM ubuntu:22.04
+
+# Avoid prompts from apt during build
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install required packages for Signal Server
+RUN apt-get update && apt-get install -y \
+    build-essential \
+    gcc \
+    g++ \
+    make \
+    libbz2-dev \
+    zlib1g-dev \
+    libpthread-stubs0-dev \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set working directory
+WORKDIR /workspace
+
+# Copy the project files
+COPY . .
+
+# Set default shell
+SHELL ["/bin/bash", "-c"]
+
+# Default command
+CMD ["/bin/bash"]

src/Makefile

@@ -25,20 +25,20 @@ GCC_VER_OK	:= $(shell test $(GCC_MAJOR) -ge 4 && \
 #endif
 
 %.o : %.cc
-	@echo -e "    CXX\t$@"
-	@$ $(CXX) $(CXXFLAGS) -c $<
+	echo -e "    CXX\t$@"
+	$(CXX) $(CXXFLAGS) -c $<
 
 %.o : %.c
-	@echo -e "    CC\t$@"
-	@$ $(CC) $(CFLAGS) -c $<
+	echo -e "    CC\t$@"
+	$(CC) $(CFLAGS) -c $<
 
 signalserver: $(objects)
-	@echo -e "    LNK\t$@"
-	@$(CXX) $(objects) -o $@ ${LIBS}
-	@echo -e " SYMLNK\tsignalserverHD -> $@"
-	@ln -sf $@ signalserverHD
-	@echo -e " SYMLNK\tsignalserverLIDAR -> $@"
-	@ln -sf $@ signalserverLIDAR
+	echo -e "    LNK\t$@"
+	$(CXX) $(objects) -o $@ ${LIBS}
+	echo -e " SYMLNK\tsignalserverHD -> $@"
+	ln -sf $@ signalserverHD
+	echo -e " SYMLNK\tsignalserverLIDAR -> $@"
+	ln -sf $@ signalserverLIDAR
 
 main.o: main.cc common.h inputs.hh outputs.hh itwom3.0.hh los.hh pel.hh \
 	image.hh