Updated Developer guides (markdown)

Developer-guides.md

@@ -194,6 +194,7 @@ In this example we will compile `nnn` on Ubuntu 20.04 with
 - [netbsd-curses](https://github.com/sabotage-linux/netbsd-curses)
 - [musl-fts](https://github.com/void-linux/musl-fts)
 - [musl libc](https://www.musl-libc.org/)
+- [pcre](https://www.pcre.org/)
 
 Discussion [thread](https://github.com/sabotage-linux/netbsd-curses/issues/46). 
 See this [patch](https://github.com/jarun/nnn/issues/1081#issuecomment-868181380) to save some more on `terminfo`.
@@ -228,6 +229,15 @@ See this [patch](https://github.com/jarun/nnn/issues/1081#issuecomment-868181380
     make CC=musl-gcc CFLAGS=-O3 -j$(($(nproc)+1))
     sudo cp .libs/libfts.so.0.0.0 /opt/nnn-libs/libfts.so
 
+#### Get pcre and compile the shared and static binaries
+
+    wget https://downloads.sourceforge.net/pcre/pcre-8.45.tar.bz2
+    ./configure --enable-unicode-properties --enable-pcre16 --enable-pcre32
+    make CFLAGS=-O3 CC=musl-gcc LDFLAGS=-static
+    sudo cp .libs/libpcre.a /opt/nnn-libs
+    make CFLAGS=-O3 CC=musl-gcc
+    sudo cp .libs/libpcre.so.1.2.13 /opt/nnn-libs
+
 #### Compile `nnn`
 
     # shared
@@ -236,7 +246,8 @@ See this [patch](https://github.com/jarun/nnn/issues/1081#issuecomment-868181380
     # shared custom
     musl-gcc -O3 -DNORL -DNOLC -DNOMOUSE -DNOBATCH -DNOFIFO -DTOURBIN_QSORT -DNOSSN -DNOUG -DNOX11 -std=c11 -Wall -Wextra -Wshadow -I/path_to/netbsd-curses/libcurses -I/path_to/musl-fts -o nnn src/nnn.c -Wl,-Bsymbolic-functions -lpthread -L/opt/nnn-libs -lcurses -lterminfo -lfts
 
-    # Note: For static compilation append `-static` to the above commands
+    # Note 1: For static compilation append `-static` to the above commands
+    # Note 2: To enable pcre, add `-I./pcre-8.45` and `-lpcre`
 
     # strip the binary
     strip nnn