compile error building sagemath 8.4 beta7 on Linux Manjaro

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I've run Arch Linux package manager to install sagemath many times before on Linux Manjaro and it never failed to compile before. This is the first time I've seen a compile error. This seems like a packaging issue?

Using

>uname -a
Linux me-pc 4.14.74-1-MANJARO 

>cat /etc/*release
Manjaro Linux
DISTRIB_ID=ManjaroLinux
DISTRIB_RELEASE=18.0.0-rc
DISTRIB_CODENAME=Illyria

I select sagemath from AUR using the package manager, click install. I fail with this error

Building sagemath-git...
Cloning into 'sagemath-git'...
==> Making package: sagemath-git 8.4.beta7.r0.ga1bfef8cf3-1 (Sat 13 Oct 2018 08:04:38 PM CDT)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Cloning sage git repo...
....
gcc -DNDEBUG -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fno-plt -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fno-plt -D_FORTIFY_SOURCE=2 -fPIC -I/usr/lib/python2.7/site-packages/cysignals -I/usr/include -I/usr/include/python2.7 -I/usr/lib/python2.7/site-packages/numpy/core/include -I/home/me/TMP/sagemath-git/src/sage/src -I/home/me/TMP/sagemath-git/src/sage/src/sage/ext -Ibuild/cythonized -I/usr/include/python2.7 -c build/cythonized/sage/calculus/integration.c -o build/temp.linux-x86_64-2.7/build/cythonized/sage/calculus/integration.o -fno-strict-aliasing -DCYTHON_CLINE_IN_TRACEBACK=1 -DGSL_DISABLE_DEPRECATED -std=c99
build/cythonized/sage/calculus/integration.c:609:10: fatal error: gsl/gsl_cblas.h: No such file or directory
 #include "gsl/gsl_cblas.h"
          ^~~~~~~~~~~~~~~~~
compilation terminated.
error: command 'gcc' failed with exit status 1
[ 15/499] gcc -DNDEBUG -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fno-plt -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -fno-plt -D_FORTIFY_SOURCE=2 -fPIC -I/usr/lib/python2.7/site-packages/cysignals -I/usr/include -I/usr/include/python2.7 -I/usr/lib/python2.7/site-packages/numpy/core/include -I/home/me/TMP/sagemath-git/src/sage/src -I/home/me/TMP/sagemath-git/src/sage/src/sage/ext -Ibuild/cythonized -I/usr/include/python2.7 -c build/cythonized/sage/calculus/interpolation.c -o build/temp.linux-x86_64-2.7/build/cythonized/sage/calculus/interpolation.o -fno-strict-aliasing -DCYTHON_CLINE_IN_TRACEBACK=1 -std=c99
build/cythonized/sage/calculus/interpolation.c:603:10: fatal error: gsl/gsl_interp.h: No such file or directory
 #include "gsl/gsl_interp.h"
          ^~~~~~~~~~~~~~~~~~
compilation terminated.

I've put the complete build log file here https://www.12000.org/tmp/10132018/sage_build_log.txt (this form will not let me attach a plain text file).

I install the Linux system new, and was trying to install sagemath on it.

Posting this here in case someone wants to have a look to see why it failed to compile. It seems to be missing some prerequisites.