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README
How to read this book
The cURL project
Network and protocols
Install curl
Source code
Build curl
Autotools
CMake
Windows
Dependencies
TLS libraries
BoringSSL
Command line basics
Using curl
HTTP with curl
FTP with curl
Using libcurl
HTTP with libcurl
Bindings
libcurl internals
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BoringSSL

build boringssl

$HOME/src is where I put the code in this example. You can pick wherever you like.
$ cd $HOME/src
$ git clone https://boringssl.googlesource.com/boringssl
$ cd boringssl
$ mkdir build
$ cd build
$ cmake -DCMAKE_POSITION_INDEPENDENT_CODE=on ..
$ make

set up the build tree to get detected by curl's configure

In the boringssl source tree root, make sure there is a lib and an include dir. The lib dir should contain the two libs (I made them symlinks into the build dir). The include dir is already present by default. Make and populate lib like this (commands issued in the source tree root, not in the build/ subdirectory).
$ mkdir lib
$ cd lib
$ ln -s ../build/ssl/libssl.a
$ ln -s ../build/crypto/libcrypto.a

configure curl

LIBS=-lpthread ./configure --with-ssl=$HOME/src/boringssl (where I point out the root of the boringssl tree)
Verify that at the end of the configuration, it says it detected BoringSSL to be used.

build curl

Run make in the curl source tree.
Now you can install curl normally with make install etc.
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build boringssl
set up the build tree to get detected by curl's configure
configure curl
build curl