Restore install target

Makefile

@@ -6,6 +6,7 @@
 #   make windows         build Windows libraries (cross-build on Linux/macOS)
 #   make static          build only the static library
 #   make shared          build only the shared library
+#   make install         install libraries, header and man pages
 #   make clean           remove obj/ and lib/
 
 ifeq ($(OS),Windows_NT)
@@ -18,6 +19,13 @@ endif
 
 BUILD ?= $(HOST_OS)
 
+prefix ?= /usr/local
+exec_prefix ?= $(prefix)
+libdir ?= $(exec_prefix)/lib
+includedir ?= $(prefix)/include
+mandir ?= $(prefix)/man
+INSTALL ?= install
+
 OBJROOT := obj
 OUTROOT := lib
 OBJDIR  := $(OBJROOT)/$(BUILD)
@@ -45,6 +53,7 @@ ifeq ($(BUILD),windows)
   IMPORT_LIB := $(OUTDIR)/libfec.dll.a
   SHARED_FLAGS := -shared -Wl,--out-implib,$(IMPORT_LIB)
   PIC_CFLAGS :=
+  REBIND :=
 else ifeq ($(BUILD),linux)
   ifeq ($(origin CC),default)
     CC := gcc
@@ -59,6 +68,7 @@ else ifeq ($(BUILD),linux)
   IMPORT_LIB :=
   SHARED_FLAGS := -shared -Wl,-soname,libfec.so
   PIC_CFLAGS := -fPIC
+  REBIND := ldconfig
 else ifeq ($(BUILD),macos)
   ifeq ($(origin CC),default)
     CC := cc
@@ -73,6 +83,7 @@ else ifeq ($(BUILD),macos)
   IMPORT_LIB :=
   SHARED_FLAGS := -dynamiclib -install_name libfec.dylib
   PIC_CFLAGS := -fPIC
+  REBIND :=
 else
   $(error Unsupported BUILD='$(BUILD)'; use BUILD=linux, BUILD=macos or BUILD=windows)
 endif
@@ -89,6 +100,7 @@ HOSTCFLAGS ?= -O2
 
 STATIC_LIB := $(OUTDIR)/libfec.a
 TEST_EXEEXT := $(if $(filter windows,$(BUILD)),.exe)
+INSTALL_LIBS := $(STATIC_LIB) $(SHARED_LIB) $(IMPORT_LIB)
 
 SOURCES := \
 	cpu_mode_generic.c fec.c sim.c \
@@ -117,12 +129,28 @@ HOST_GEN_OBJECTS := $(TOOLDIR)/gen_ccsds.o $(TOOLDIR)/init_rs_char.o
 
 .DEFAULT_GOAL := all
 .SECONDARY: $(TEST_OBJECTS)
-.PHONY: all build linux macos windows static shared test check-tools clean
+.PHONY: all build linux macos windows static shared install test check-tools clean
 
 all: build
 build: check-tools static shared
 static: $(STATIC_LIB)
 shared: $(SHARED_LIB)
+install: build
+	mkdir -p $(DESTDIR)$(libdir)
+	$(INSTALL) -m 644 -p $(INSTALL_LIBS) $(DESTDIR)$(libdir)
+ifneq ($(REBIND),)
+ifneq ($(DESTDIR),)
+	@echo "Skipping $(REBIND) for staged install under DESTDIR=$(DESTDIR)"
+else ifeq ($(BUILD),$(HOST_OS))
+	$(REBIND)
+else
+	@echo "Skipping $(REBIND) for cross install BUILD=$(BUILD)"
+endif
+endif
+	mkdir -p $(DESTDIR)$(includedir)
+	$(INSTALL) -m 644 -p fec.h $(DESTDIR)$(includedir)
+	mkdir -m 0755 -p $(DESTDIR)$(mandir)/man3
+	$(INSTALL) -m 644 -p simd-viterbi.3 rs.3 dsp.3 $(DESTDIR)$(mandir)/man3
 ifeq ($(BUILD),$(HOST_OS))
 test: $(TEST_PROGRAMS)
 	$(OUTDIR)/vtest27$(TEST_EXEEXT) -e 3.0 -n 1000 -v