/usr/bin/curl-config is in libcurl4-nss-dev 7.22.0-3ubuntu4.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 | #! /bin/sh
#***************************************************************************
#                                  _   _ ____  _
#  Project                     ___| | | |  _ \| |
#                             / __| | | | |_) | |
#                            | (__| |_| |  _ <| |___
#                             \___|\___/|_| \_\_____|
#
# Copyright (C) 2001 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at http://curl.haxx.se/docs/copyright.html.
#
# You may opt to use, copy, modify, merge, publish, distribute and/or sell
# copies of the Software, and permit persons to whom the Software is
# furnished to do so, under the terms of the COPYING file.
#
# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
# KIND, either express or implied.
#
###########################################################################
prefix=/usr
exec_prefix=${prefix}
includedir=${prefix}/include
usage()
{
    cat <<EOF
Usage: curl-config [OPTION]
Available values for OPTION include:
  --built-shared says 'yes' if libcurl was built shared
  --ca        ca bundle install path
  --cc        compiler
  --cflags    pre-processor and compiler flags
  --checkfor [version] check for (lib)curl of the specified version
  --configure the arguments given to configure when building curl
  --features  newline separated list of enabled features
  --help      display this help and exit
  --libs      library linking information
  --prefix    curl install prefix
  --protocols newline separated list of enabled protocols
  --static-libs static libcurl library linking information
  --version   output version information
  --vernum    output the version information as a number (hexadecimal)
EOF
    exit $1
}
if test $# -eq 0; then
    usage 1
fi
while test $# -gt 0; do
    case "$1" in
    # this deals with options in the style
    # --option=value and extracts the value part
    # [not currently used]
    -*=*) value=`echo "$1" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
    *) value= ;;
    esac
    case "$1" in
    --built-shared)
        echo yes
        ;;
    --ca)
	echo ""/etc/ssl/certs/ca-certificates.crt""
	;;
    --cc)
	echo "gcc"
	;;
    --prefix)
	echo "$prefix"
	;;
    --feature|--features)
        for feature in SSL IPv6 libz IDN NTLM NTLM_WB ""; do
            test -n "$feature" && echo "$feature"
        done
	;;
    --protocols)
        for protocol in DICT FILE FTP FTPS GOPHER HTTP HTTPS IMAP IMAPS LDAP POP3 POP3S RTMP RTSP SMTP SMTPS TELNET TFTP; do
            echo "$protocol"
        done
	;;
    --version)
	echo libcurl 7.22.0
	exit 0
	;;
    --checkfor)
        checkfor=$2
        cmajor=`echo $checkfor | cut -d. -f1`
        cminor=`echo $checkfor | cut -d. -f2`
        # when extracting the patch part we strip off everything after a
	# dash as that's used for things like version 1.2.3-CVS
	cpatch=`echo $checkfor | cut -d. -f3 | cut -d- -f1`
        checknum=`echo "$cmajor*256*256 + $cminor*256 + ${cpatch:-0}" | bc`
        numuppercase=`echo 071600 | tr 'a-f' 'A-F'`
        nownum=`echo "obase=10; ibase=16; $numuppercase" | bc`
	if test "$nownum" -ge "$checknum"; then
	  # silent success
	  exit 0
	else
	  echo "requested version $checkfor is newer than existing 7.22.0"
	  exit 1
	fi
	;;
    --vernum)
	echo 071600
	exit 0
	;;
    --help)
	usage 0
	;;
    --cflags)
       	if test "X${prefix}/include" = "X/usr/include"; then
          echo ""
        else
          echo "-I${prefix}/include"
        fi
       	;;
    --libs)
	if test "X${prefix}/lib/x86_64-linux-gnu" != "X/usr/lib" -a "X${prefix}/lib/x86_64-linux-gnu" != "X/usr/lib64"; then
	   CURLLIBDIR="-L${prefix}/lib/x86_64-linux-gnu "
	else
	   CURLLIBDIR=""
	fi
	if test "Xno" = "Xyes"; then
	  echo ${CURLLIBDIR}-lcurl -Wl,-Bsymbolic-functions -Wl,-z,relro -lidn -llber -lldap -lrt -lgssapi_krb5 -lz -lnss3 -lnssutil3 -lsmime3 -lssl3 -lplds4 -lplc4 -lnspr4 -lpthread -ldl -lrtmp 
	else
	  echo ${CURLLIBDIR}-lcurl -Wl,-Bsymbolic-functions -Wl,-z,relro 
	fi
	;;
    --static-libs)
	echo ${prefix}/lib/x86_64-linux-gnu/libcurl.a -Wl,-Bsymbolic-functions -Wl,-z,relro -lidn -llber -lldap -lrt -lgssapi_krb5 -lz -lnss3 -lnssutil3 -lsmime3 -lssl3 -lplds4 -lplc4 -lnspr4 -lpthread -ldl -lrtmp 
	;;
    --configure)
      echo " '--build' 'x86_64-linux-gnu' '--prefix=/usr' '--mandir=/usr/share/man' '--disable-dependency-tracking' '--enable-ipv6' '--enable-manual' '--enable-versioned-symbols' '--libdir=${prefix}/lib/x86_64-linux-gnu' '--with-lber-lib=lber' '--with-gssapi=/usr' '--with-ca-bundle=/etc/ssl/certs/ca-certificates.crt' '--without-ssl' '--with-nss' '--without-libssh2' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro' 'CPPFLAGS=-D_FORTIFY_SOURCE=2'"
    ;;
    *)
        echo "unknown option: $1"
	usage 1
	;;
    esac
    shift
done
exit 0
 |