Disable extraneous linking in released binaries

Libraries present on the CI runner system might affect the released
binaries. Specifically, the MacOS runner in GitHub has librtsp, libidn2
and zstd installed, which makes curl link against them.

Explicitly disable these linking, as we want to keep the precompiled
binaries in our releases with minimal requirements. A user wishing to
use these specific features can build from source on a system with these
libraries present.

.github/workflows/build-and-test-make.yml

@@ -105,7 +105,8 @@ jobs:
         if: matrix.arch == 'x86_64'
         run: |
           mkdir ${{ runner.temp }}/install
-          ./configure --prefix=${{ runner.temp }}/install
+          ./configure --prefix=${{ runner.temp }}/install \
+            CURL_CONFIG_FLAGS="--disable-rtsp --without-libidn2 --without-zstd"
 
       # When cross compiling a more complicated configuration is needed, since
       # curl's configure script can't figure out where some files and libraries

INSTALL.md

@@ -134,6 +134,15 @@ cd ../ && rm -Rf build
 
 To compile curl-impersonate statically with libcurl-impersonate, pass `--enable-static` to the `configure` script.
 
+### Configuring curl's build
+
+You might want to configure the underlying curl build to your needs.
+To do that, use the `CURL_CONFIG_FLAGS` variable. These flags will be passed down to curl's `configure` script:
+
+```sh
+../configure CURL_CONFIG_FLAGS="--disable-rtsp"
+```
+
 ### A note about the Firefox version
 
 The Firefox version compiles a static version of nss, Firefox's TLS library.

Makefile.in

@@ -57,6 +57,9 @@ CC = @CC@
 CXX = @CXX@
 STRIP = @STRIP@
 
+# Additional flags to be passed down to curl's configure script during build.
+CURL_CONFIG_FLAGS = @CURL_CONFIG_FLAGS@
+
 # Auto-generate Makefile help.
 # Borrowed from https://marmelab.com/blog/2016/02/29/auto-documented-makefile.html
 help: ## Show this help message
@@ -360,7 +363,8 @@ $(CURL_VERSION)/.firefox: $(firefox_libs) $(CURL_VERSION).tar.xz $(CURL_VERSION)
 	# If the user provided the --host flag to our configure script
 	# (for cross compilation), then pass it on to curl.
 	{ \
-	  config_flags="--prefix=@prefix@"; \
+	  config_flags="$(CURL_CONFIG_FLAGS)"; \
+	  config_flags+=" --prefix=@prefix@"; \
 	  config_flags+=" --with-nghttp2=$(nghttp2_install_dir)"; \
 	  config_flags+=" --with-brotli=$(brotli_install_dir)"; \
 	  config_flags+=" --with-nss=$(nss_install_dir) --with-nss-deprecated"; \
@@ -401,7 +405,8 @@ $(CURL_VERSION)/.chrome: $(chrome_libs)	$(CURL_VERSION).tar.xz $(CURL_VERSION)/.
 	# If the user provided the --host flag to our configure script
 	# (for cross compilation), then pass it on to curl.
 	{ \
-	  config_flags="--prefix=@prefix@"; \
+	  config_flags="$(CURL_CONFIG_FLAGS)"; \
+	  config_flags="$$config_flags --prefix=@prefix@"; \
 	  config_flags="$$config_flags --with-nghttp2=$(nghttp2_install_dir)"; \
 	  config_flags="$$config_flags --with-brotli=$(brotli_install_dir)"; \
 	  config_flags="$$config_flags --with-openssl=$(boringssl_install_dir)"; \

README.md

@@ -74,12 +74,16 @@ More documentation is available in the [docs/](docs/README.md) directory.
 There are two versions of `curl-impersonate` for technical reasons. The **chrome** version is used to impersonate Chrome, Edge and Safari. The **firefox** version is used to impersonate Firefox.
 
 ### Pre-compiled binaries
-Pre-compiled binaries for Linux and macOS (Intel) are available at the [GitHub releases](https://github.com/lwthiker/curl-impersonate/releases) page. Before you use them you need to install nss (Firefox's TLS library) and CA certificates:
+Pre-compiled binaries for Linux and macOS (Intel) are available at the [GitHub releases](https://github.com/lwthiker/curl-impersonate/releases) page.
+Before you use them you need to install nss (Firefox's TLS library) and CA certificates:
 * Ubuntu - `sudo apt install libnss3 nss-plugin-pem ca-certificates`
 * Red Hat/Fedora/CentOS - `yum install nss nss-pem ca-certificates`
 * Archlinux - `pacman -S nss ca-certificates`
 * macOS - `brew install nss ca-certificates`
 
+Also ensure you have zlib installed on your system.
+zlib is almost always present, but on some minimal systems it might be missing.
+
 The pre-compiled binaries contain libcurl-impersonate and a statically compiled curl-impersonate for ease of use.
 
 The pre-compiled Linux binaries are built for Ubuntu systems. On other distributions if you have errors with certificate verification you may have to tell curl where to find the CA certificates. For example:

configure

@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.71 for curl-impersonate 0.5.0.
+# Generated by GNU Autoconf 2.71 for curl-impersonate 0.6.0.
 #
 # Report bugs to <[email protected]>.
 #
@@ -610,15 +610,16 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='curl-impersonate'
 PACKAGE_TARNAME='curl-impersonate'
-PACKAGE_VERSION='0.5.0'
-PACKAGE_STRING='curl-impersonate 0.5.0'
+PACKAGE_VERSION='0.6.0'
+PACKAGE_STRING='curl-impersonate 0.6.0'
 PACKAGE_BUGREPORT='[email protected]'
 PACKAGE_URL=''
 
 ac_subst_vars='LTLIBOBJS
 LIBOBJS
 ninja
 cmake
+CURL_CONFIG_FLAGS
 with_libnssckbi
 with_ca_path
 with_ca_bundle
@@ -701,7 +702,8 @@ LIBS
 CPPFLAGS
 CXX
 CXXFLAGS
-CCC'
+CCC
+CURL_CONFIG_FLAGS'
 
 
 # Initialize some variables set by options.
@@ -1250,7 +1252,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures curl-impersonate 0.5.0 to adapt to many kinds of systems.
+\`configure' configures curl-impersonate 0.6.0 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1317,7 +1319,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of curl-impersonate 0.5.0:";;
+     short | recursive ) echo "Configuration of curl-impersonate 0.6.0:";;
    esac
   cat <<\_ACEOF
 
@@ -1354,6 +1356,8 @@ Some influential environment variables:
               you have headers in a nonstandard directory <include dir>
   CXX         C++ compiler command
   CXXFLAGS    C++ compiler flags
+  CURL_CONFIG_FLAGS
+              "configuration flags to be passed down to curls 'configure'"
 
 Use these variables to override the choices made by `configure' or to help
 it to find libraries and programs with nonstandard names/locations.
@@ -1422,7 +1426,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-curl-impersonate configure 0.5.0
+curl-impersonate configure 0.6.0
 generated by GNU Autoconf 2.71
 
 Copyright (C) 2021 Free Software Foundation, Inc.
@@ -1584,7 +1588,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by curl-impersonate $as_me 0.5.0, which was
+It was created by curl-impersonate $as_me 0.6.0, which was
 generated by GNU Autoconf 2.71.  Invocation command line was
 
   $ $0$ac_configure_args_raw
@@ -4223,6 +4227,8 @@ else $as_nop
 fi
 
 
+
+
 # BoringSSL requires cmake 3.5+, which is sometimes available under
 # "cmake3" instead of "cmake"
 for ac_prog in cmake3 cmake
@@ -4859,7 +4865,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by curl-impersonate $as_me 0.5.0, which was
+This file was extended by curl-impersonate $as_me 0.6.0, which was
 generated by GNU Autoconf 2.71.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -4914,7 +4920,7 @@ ac_cs_config_escaped=`printf "%s\n" "$ac_cs_config" | sed "s/^ //; s/'/'\\\\\\\\
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config='$ac_cs_config_escaped'
 ac_cs_version="\\
-curl-impersonate config.status 0.5.0
+curl-impersonate config.status 0.6.0
 configured by $0, generated by GNU Autoconf 2.71,
   with options \\"\$ac_cs_config\\"
 

configure.ac

@@ -67,6 +67,8 @@ AC_ARG_WITH([libnssckbi],
     [AC_SUBST([with_libnssckbi], ["$withval"])],
     [AC_SUBST([with_libnssckbi], [""])])
 
+AC_ARG_VAR([CURL_CONFIG_FLAGS], ["configuration flags to be passed down to curls 'configure'"])
+
 # BoringSSL requires cmake 3.5+, which is sometimes available under
 # "cmake3" instead of "cmake"
 AC_CHECK_PROGS([cmake], [cmake3 cmake])