MMC5 not installing

[monkeyfume@computer ~]$ pacaur -S multimc5
:: Package multimc5 not found in repositories, trying AUR...
:: resolving dependencies...
:: looking for inter-conflicts...

AUR Packages  (1) multimc5-0.6.2-2

:: Proceed with installation? [Y/n] y
:: Retrieving package(s)...
:: multimc5 build files are up-to-date -- skipping
:: Checking multimc5 integrity...
==> Making package: multimc5 0.6.2-2 (Thu 06 Sep 2018 01:23:50 PM EDT)
==> Retrieving sources...
  -> Found 0.6.2.tar.gz
  -> Found multimc-0.5.0.tar.gz
  -> Found multimc-2.tar.gz
  -> Found multimc-fix-build-with-qt-511.patch
  -> Found quazip-fix-build-with-qt-511.patch
==> Validating source files with sha512sums...
    0.6.2.tar.gz ... Passed
    multimc-0.5.0.tar.gz ... Passed
    multimc-2.tar.gz ... Passed
    multimc-fix-build-with-qt-511.patch ... Passed
    quazip-fix-build-with-qt-511.patch ... Passed
:: Building multimc5 package(s)...
==> Making package: multimc5 0.6.2-2 (Thu 06 Sep 2018 01:23:52 PM EDT)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> WARNING: Using existing $srcdir/ tree
==> Removing existing $pkgdir/ directory...
==> Starting build()...
-- The C compiler identification is GNU 8.2.1
-- The CXX compiler identification is GNU 8.2.1
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Git commit: e55c8c2d6d3c00b64aba4807dec419196a6a7f10
-- Git refspec: refs/heads/master
-- Compiling for linux system with share/multimc and MULTIMC_LINUX_DATADIR
Using override nbt++ name: MultiMC_nbt++
-- Performing Test COMPILER_HAS_HIDDEN_VISIBILITY
-- Performing Test COMPILER_HAS_HIDDEN_VISIBILITY - Success
-- Performing Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY
-- Performing Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY - Success
-- Performing Test COMPILER_HAS_DEPRECATED_ATTR
-- Performing Test COMPILER_HAS_DEPRECATED_ATTR - Success
/home/monkeyfume/.cache/pacaur/multimc5/src/MultiMC5-0.6.2/cmake
CMake Error at libraries/launcher/CMakeLists.txt:2 (project):
  No CMAKE_Java_COMPILER could be found.

  Tell CMake where to find the compiler by setting either the environment
  variable "JAVA_COMPILER" or the CMake cache entry CMAKE_Java_COMPILER to
  the full path to the compiler, or to the compiler name if it is in the
  PATH.


-- Configuring incomplete, errors occurred!
See also "/home/monkeyfume/.cache/pacaur/multimc5/src/MultiMC5-0.6.2/build/CMakeFiles/CMakeOutput.log".
==> ERROR: A failure occurred in build().
    Aborting...
:: failed to build multimc5 package(s)
[monkeyfume@computer ~]$