From 73836e04160123e28b8c39edbf6de5a4896f251d Mon Sep 17 00:00:00 2001
From: Uladzimir Karpenka <i@vladimir.cc>
Date: Thu, 25 Jun 2026 14:08:22 +0300
Subject: [PATCH] Restore install target

---
 INSTALL  | 20 +++++++++++++++-----
 Makefile | 30 +++++++++++++++++++++++++++++-
 README   |  3 +++
 3 files changed, 47 insertions(+), 6 deletions(-)

diff --git a/INSTALL b/INSTALL
index e9e5baf..7e0720b 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,8 +1,7 @@
 INSTALLATION INSTRUCTIONS
 
-To build and install the libfec libraries, simply say
+To build and install the libfec libraries for the host platform, say
 
-./configure
 make
 make test (optional)
 make install (as root)
@@ -11,6 +10,19 @@ By default, "make install" puts the libfec libraries in
 /usr/local/lib, the include files in /usr/local/include, and the
 manual page in /usr/local/man.
 
+To build a specific platform target, use one of:
+
+make linux
+make macos
+make windows
+
+Use DESTDIR for staged packaging installs, for example:
+
+make install DESTDIR=/tmp/libfec-package
+
+You can override prefix, libdir, includedir and mandir on the make
+command line.
+
 You may have an old version of the GNU assembler that cannot handle
 the relatively new SSE2 mnemonics. Update your version of the GNU
 "binutils" package.
@@ -22,8 +34,7 @@ http://sources.redhat.com/binutils/
 
 TESTING THE FEC LIBRARY
 
-After running the ./configure script, optional tests can be built and
-run as follows:
+Optional native tests can be built and run as follows:
 
 make test
 
@@ -36,4 +47,3 @@ broken.
 Phil Karn, karn@ka9q.net
 
 
-
diff --git a/Makefile b/Makefile
index 54dad8d..b0d62ab 100644
--- a/Makefile
+++ b/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
diff --git a/README b/README
index f20cec2..95306c2 100644
--- a/README
+++ b/README
@@ -111,6 +111,9 @@ The resulting files are in lib/linux/, lib/macos/ or lib/windows/. Use
 `make static` or `make shared` to build only one library type, and `make clean`
 to remove all generated files.
 
+Use `make install` to install under /usr/local, or pass `DESTDIR` and the
+standard `prefix`, `libdir`, `includedir` or `mandir` variables for packaging.
+
 To build and run the native test programs:
 
     make test