C library build and install make targets.

Makefile

@@ -59,6 +59,7 @@ test-c:
 	    -o detools.no-crle.o
 	$(CC) $(CFLAGS) $(C_SOURCES) -llzma -o main
 	./main
+	$(MAKE) -C src/c library
 	$(MAKE) -C src/c
 	src/c/detools apply_patch tests/files/foo/old tests/files/foo/patch foo.new
 	cmp foo.new tests/files/foo/new

detools/version.py

@@ -1 +1 @@
-__version__ = '0.28.0'
+__version__ = '0.29.0'

src/c/Makefile

@@ -1,6 +1,8 @@
-ifeq ($(origin CC), default)
-CC = gcc
-endif
+CC = $(CROSS_COMPILE)gcc
+AR = $(CROSS_COMPILE)ar
+
+# Install prefix.
+PREFIX ?= /usr/local
 
 CFLAGS := \
 	-Wall \
@@ -10,8 +12,8 @@ CFLAGS := \
 	-Wformat=2 \
 	-Wshadow \
 	-Werror \
-	-Wpedantic \
-	-std=c99
+	-std=c99 \
+	-O2
 
 SRC := \
 	heatshrink/heatshrink_decoder.c \
@@ -20,3 +22,13 @@ SRC := \
 
 all:
 	$(CC) $(CFLAGS) $(SRC) -llzma -o detools
+
+library:
+	$(CC) $(CFLAGS) detools.c -c -o detools.o
+	$(AR) cr libdetools.a detools.o
+
+install:
+	mkdir -p $(PREFIX)/include
+	install -c -m 644 detools.h $(PREFIX)/include
+	mkdir -p $(PREFIX)/lib
+	install -c -m 644 libdetools.a $(PREFIX)/lib