E: Unable to locate package libssl-dev when trying to download 32bit OpenSSL on 64bit system

I'm trying to compile multiarch project the right (means reproducible) way, so I decided to install all libraries through apt-get. But ever since the system noticed what I'm doing, it became hostile. While many people claim that you can install 32bit OpenSSL through this command: apt-get install libssl-dev:i386 I ended up with this result: E: Unable to locate package libssl-dev I did apt-get update and my OS version is Debian GNU/Linux 8 (*Jessie*). Am I doing something wrong? I tried to check what i386 libraries are actually available: XXXXX@debianvirtualbox:~$ aptitude search i386 p debian-installer-8-netboot-i386 - Debian-installer network boot images for i386 v debian-installer-netboot-i386 - p installation-guide-i386 - Debian installation guide for i386 p installation-guide-kfreebsd-i386 - Debian installation guide for kFreeBSD i386 i libc6-dev-i386 - GNU C Library: 32-bit development libraries for AMD64 i A libc6-i386 - GNU C Library: 32-bit shared libraries for AMD64 v qemu-system-i386 -