Add static compilation flag

make command:

make O_STATIC=1 O_NORL=1 strip

Makefile

@@ -57,6 +57,12 @@ CFLAGS += $(CFLAGS_CURSES)
 
 LDLIBS += $(LDLIBS_CURSES)
 
+# static compilation needs libgpm development package
+ifeq ($(O_STATIC),1)
+	LDFLAGS += -static
+	LDLIBS += -lgpm
+endif
+
 DISTFILES = src nnn.1 Makefile README.md LICENSE
 SRC = src/nnn.c
 HEADERS = src/nnn.h

README.md

@@ -180,4 +180,4 @@ Completion scripts for Bash, Fish and Zsh are [available](misc/auto-completion).
 - [Maxim Baz](https://github.com/maximbaz)
 - and other contributors
 
-`nnn` is actively developed. Visit the to the [ToDo list](https://github.com/jarun/nnn/issues/386) to contribute or see the features in progress.
+`nnn` is actively developed. Visit the to the [ToDo list](https://github.com/jarun/nnn/issues/448) to contribute or see the features in progress.