Fix compiler errors

Makefile

@@ -2,17 +2,30 @@
 CC = gcc
 CFLAGS = -I. -Wall -Wextra -O0 -g3
 LFLAGS = -lssl -lcrypto
+AR = ar
 
 CFILES = $(shell find src -name "*.c")
 HFILES = $(shell find src -name "*.h")
+OFILES = $(patsubst %.c,%.o,$(CFILES))
+
+# Library names
+LIBNAME = chttp
+STATIC_LIB = lib$(LIBNAME).a
+SHARED_LIB = lib$(LIBNAME).so
 
 # Detect OS and set executable extension
 ifeq ($(OS),Windows_NT)
     EXT = .exe
+    SHARED_LIB = $(LIBNAME).dll
 else
     EXT = .out
 endif
 
+# Installation directories
+PREFIX ?= /usr/local
+LIBDIR = $(PREFIX)/lib
+INCDIR = $(PREFIX)/include
+
 EXAMPLES_CLIENT_SRC := $(shell ls examples/client/*.c 2>/dev/null)
 EXAMPLES_SERVER_SRC := $(shell ls examples/server/*.c 2>/dev/null)
 EXAMPLES_ENGINE_SRC := $(shell ls examples/engine/*.c 2>/dev/null)
@@ -21,11 +34,25 @@ EXAMPLES_CLIENT := $(patsubst %.c,%$(EXT),$(EXAMPLES_CLIENT_SRC))
 EXAMPLES_SERVER := $(patsubst %.c,%$(EXT),$(EXAMPLES_SERVER_SRC))
 EXAMPLES_ENGINE := $(patsubst %.c,%$(EXT),$(EXAMPLES_ENGINE_SRC))
 
-all: chttp.c chttp.h examples
+all: chttp.c chttp.h examples lib
+
+lib: $(STATIC_LIB) $(SHARED_LIB)
 
 chttp.c chttp.h: $(HFILES) $(CFILES)
 	python misc/amalg.py
 
+# Object files from source files
+%.o: %.c $(HFILES)
+	$(CC) $(CFLAGS) -c $< -o $@
+
+# Static library
+$(STATIC_LIB): $(OFILES)
+	$(AR) rcs $@ $^
+
+# Shared library
+$(SHARED_LIB): $(OFILES)
+	$(CC) -shared -o $@ $^ $(LFLAGS)
+
 examples: $(EXAMPLES_CLIENT) $(EXAMPLES_SERVER) $(EXAMPLES_ENGINE)
 
 examples/client/%$(EXT): examples/client/%.c chttp.c chttp.h
@@ -37,6 +64,28 @@ examples/server/%$(EXT): examples/server/%.c chttp.c chttp.h
 examples/engine/%$(EXT): examples/engine/%.c chttp.c chttp.h
 	$(CC) $(CFLAGS) $< chttp.c -o $@ $(LFLAGS)
 
+# Installation targets
+install: install-lib install-headers
+
+install-lib: $(STATIC_LIB) $(SHARED_LIB)
+	install -d $(LIBDIR)
+	install -m 644 $(STATIC_LIB) $(LIBDIR)/
+	install -m 755 $(SHARED_LIB) $(LIBDIR)/
+
+install-headers: chttp.h
+	install -d $(INCDIR)
+	install -m 644 chttp.h $(INCDIR)/
+
+uninstall:
+	rm -f $(LIBDIR)/$(STATIC_LIB)
+	rm -f $(LIBDIR)/$(SHARED_LIB)
+	rm -f $(INCDIR)/chttp.h
+
 clean:
 	rm -f client_example server_example
 	rm -f examples/client/*$(EXT) examples/server/*$(EXT) examples/engine/*$(EXT)
+	rm -f $(OFILES)
+	rm -f $(STATIC_LIB) $(SHARED_LIB)
+	rm -f chttp.c chttp.h
+
+.PHONY: all lib examples install install-lib install-headers uninstall clean