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在進行libcurl的源碼編譯之中，參照官方文檔和google搜索出來的總是編譯失敗，索性根據提示的失敗一步一步查出原因，說白了，就是OS X缺少gnu的幾個工具，還需要初始化config才行，libcurl官方根本沒提及，ok，那就自己搞定。

首先，需要安裝autoconf和automake工具

1）安裝m4

http://www.gnu.org/software/m4/

tar -xzvf m4-1.4.17.tar.gz

cd m4-1.4.17

./configure --PRefix=/usr/local

make

sudo make install

2）安裝autoconf

http://www.gnu.org/software/autoconf/

tar -xzvf autoconf-2.69.tar.gz

cd autoconf-2.69

./configure --prefix=/usr/local

make

sudo make install

3）安裝automake

http://www.gnu.org/software/automake/

tar xzvf automake-1.14.tar.gz

cd automake-1.14

./configure --prefix=/usr/local

make

sudo make install

4）安裝libtool

http://www.gnu.org/software/libtool/

tar xzvf libtool-2.4.2.tar.gz

cd libtool-2.4.2

./configure --prefix=/usr/local

make

sudo make install

5）下載libcurl源碼，運行libcurl初始化腳本

git clone https://github.com/bagder/curl.git

cd curl

./buildconf

6）編譯simulator版本，首先需要設置諸多編譯環境，本人mac環境是xcode 6.4， sdk是8.4為例

export

export CC="/applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang"

export CFLAGS="-arch i386 -pipe -Os -gdwarf-2 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.4.sdk"

export LDFLAGS="-arch i386 –isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.4.sdk"

./configure --disable-shared --enable-static --host="i386-apple-darwin" --prefix=/usr/local --with-darwinssl --enable-threaded-resolver

make -j `sysctl -n hw.logicalcpu_max

cp lib/.libs/libcurl.a ~/Desktop/libcurl-i386.a

make clean

7）編譯arm版本稍有不同

export IPHONEOS_DEPLOYMENT_TARGET="8.4"

$ export CC="/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang"

$ export CFLAGS="-arch [ARCH] -pipe -Os -gdwarf-2 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.4.sdk"

$ export LDFLAGS="-arch [ARCH] -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.4.sdk"

$ ./configure --disable-shared --enable-static --host="[ARCH]-apple-darwin" --prefix=/usr/local --with-darwinssl --enable-threaded-resolver

$ make -j `sysctl -n hw.logicalcpu_max`

cp lib/.libs/libcurl.a ~/Desktop/libcurl-[ARCH].a

make clean

此處特別注意[ARCH]代表armv7,armvs7和arm64，但是[ARCH]-apple-darwin這里卻不存在arm64-apple-darwin，需要改成arm-apple-darwin即可config通過。

8）合并libcurl

cd ~/Desktop

$ lipo -create -output libcurl.a libcurl*