背景说明
lua-gd 也需要链接 luajit 才能被 OpenResty 使用，因此 luarocks 也需要重新编译。
编译 luarocks
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sudo yum install patch gcc autoconf automake git wget
wget https://luarocks.github.io/luarocks/releases/luarocks-3.12.2.tar.gz
tar -xf luarocks-3.12.2.tar.gz
cd luarocks-3.12.2
./configure --prefix=/usr/local/openresty/luajit \
--with-lua=/usr/local/openresty/luajit/ \
--lua-suffix=jit \
--with-lua-include=/usr/local/openresty/luajit/include/luajit-2.1
make
sudo make install
编译 lua-gd
lua-gd patch
将这个 patch 保存到当前目录，名称为 lua-gd.patch
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diff --git a/Makefile b/Makefile
index 21f1d6f..34a01df 100644
--- a/Makefile
+++ b/Makefile
@@ -29,7 +29,7 @@
VERSION=2.0.33r3
# Command used to run Lua code
-LUABIN=lua5.1
+LUABIN=luajit
# Optimization for the brave of heart ;)
OMITFP=-fomit-frame-pointer
@@ -41,15 +41,16 @@ OMITFP=-fomit-frame-pointer
# comment out these lines and uncomment and change the next ones.
# Name of .pc file. "lua5.1" on Debian/Ubuntu
-LUAPKG=lua5.1
+LUAPKG=luajit
OUTFILE=gd.so
-CFLAGS=-O3 -Wall -fPIC $(OMITFP)
+CFLAGS=-O3 -Wall -fPIC $(OMITFP) -I/usr/local/openresty/luajit/include/luajit-2.1
CFLAGS+=`pkg-config $(LUAPKG) --cflags`
CFLAGS+=-DVERSION=\"$(VERSION)\"
GDFEATURES=-DGD_XPM -DGD_JPEG -DGD_FONTCONFIG -DGD_FREETYPE -DGD_PNG -DGD_GIF
-LFLAGS=-shared `pkg-config $(LUAPKG) --libs` -lgd
+LFLAGS=-shared `pkg-config $(LUAPKG) --libs` -Wl,-rpath,/usr/local/openresty/luajit/lib -lgd -L/usr/local/openresty/luajit/lib -lluajit-5.1
+
INSTALL_PATH := `pkg-config $(LUAPKG) --variable=INSTALL_CMOD`
编译 lua-gd
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set -e
git clone https://github.com/ittner/lua-gd.git
cd lua-gd
cat ../lua-gd.patch | patch -p1
/usr/local/openresty/luajit/bin/luarocks build
编译完成后 gd.so 位于 /usr/local/openresty/luajit/lib/lua/5.1/gd.so
