aptitude install php5-dev libssl-dev
The following NEW packages will be installed:
  autoconf{a} automake{a} autotools-dev{a} cpp{a} cpp-4.7{a} gcc{a} gcc-4.7{a} gcc-4.7-base{a} libc-dev-bin{ab} libc6-dev{ab} libgomp1{a} libitm1{a} libltdl-dev{a} libltdl7{a} libmpc2{a}
  libquadmath0{a} libssl-dev{b} libssl-doc{a} libtool{a} linux-libc-dev{a} m4{a} manpages-dev{a} php5-dev shtool{a} zlib1g-dev{ab}
0 packages upgraded, 25 newly installed, 0 to remove and 0 not upgraded.
Need to get 26.1 MB of archives. After unpacking 67.2 MB will be used.
The following packages have unmet dependencies:
 zlib1g-dev : Depends: zlib1g (= 1:1.2.7.dfsg-13) but 1:1.2.8.dfsg-2+b1 is installed.
 libc-dev-bin : Depends: libc6 (< 2.14) but 2.19-18+deb8u4 is installed.
 libssl-dev : Depends: libssl1.0.0 (= 1.0.1e-2+deb7u21) but 1.0.1t-1+deb8u2 is installed.
 libc6-dev : Depends: libc6 (= 2.13-38+deb7u11) but 2.19-18+deb8u4 is installed.
 gcc-4.9-base : Breaks: gcc-4.7-base (< 4.7.3) but 4.7.2-5 is to be installed.
open: 119; closed: 131; defer: 42; conflict: 51                                                                                                                                                              oThe following actions will resolve these dependencies:

      Keep the following packages at their current version:
1)      cpp [Not Installed]
2)      cpp-4.7 [Not Installed]
3)      gcc [Not Installed]
4)      gcc-4.7 [Not Installed]
5)      gcc-4.7-base [Not Installed]
6)      libc-dev-bin [Not Installed]
7)      libc6-dev [Not Installed]
8)      libgomp1 [Not Installed]
9)      libitm1 [Not Installed]
10)     libquadmath0 [Not Installed]
11)     libssl-dev [Not Installed]
12)     libtool [Not Installed]
13)     php5-dev [Not Installed]
14)     zlib1g-dev [Not Installed]

      Leave the following dependencies unresolved:
15)     libltdl-dev recommends libtool
16)     libc6-dev recommends gcc | c-compiler


Accept this solution? [Y/n/q/?] Y
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.