我需要安装xts才能运行预测包。该错误看起来与gfortran有关，而不是“支持”名为“.stabs”的“指令”。我安装了via the pkg file on CRAN的gfortran编译器，clang4是通过package provided here
安装的这是来自RStudio的（删节）输出：
> install.packages('xts')
There is a binary version available but the source version is later:
binary source needs_compilation
xts 0.10-0 0.10-1 TRUE
Do you want to install from sources the package which needs compilation?
y/n: y
installing the source package ‘xts’
trying URL 'https://cran.rstudio.com/src/contrib/xts_0.10-1.tar.gz'
Content type 'application/x-gzip' length 524633 bytes (512 KB)
==================================================
downloaded 512 KB
* installing *source* package ‘xts’ ...
** package ‘xts’ successfully unpacked and MD5 sums checked
** libs
/usr/local/clang4/bin/clang -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG -I../inst/include -I"/Library/Frameworks/R.framework/Versions/3.4/Resources/library/zoo/include" -I/usr/local/include -fPIC -Wall -g -O2 -c add_class.c -o add_class.o
/usr/local/clang4/bin/clang -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG -I../inst/include -I"/Library/Frameworks/R.framework/Versions/3.4/Resources/library/zoo/include" -I/usr/local/include -fPIC -Wall -g -O2 -c any.c -o any.o
/usr/local/clang4/bin/clang -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG -I../inst/include -I"/Library/Frameworks/R.framework/Versions/3.4/Resources/library/zoo/include" -I/usr/local/include -fPIC -Wall -g -O2 -c attr.c -o attr.o
/usr/local/clang4/bin/clang -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG -I../inst/include -I"/Library/Frameworks/R.framework/Versions/3.4/Resources/library/zoo/include" -I/usr/local/include -fPIC -Wall -g -O2 -c binsearch.c -o binsearch.o
/usr/local/clang4/bin/clang -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG -I../inst/include -I"/Library/Frameworks/R.framework/Versions/3.4/Resources/library/zoo/include" -I/usr/local/include -fPIC -Wall -g -O2 -c coredata.c -o coredata.o
/usr/local/clang4/bin/clang -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG -I../inst/include -I"/Library/Frameworks/R.framework/Versions/3.4/Resources/library/zoo/include" -I/usr/local/include -fPIC -Wall -g -O2 -c diff.c -o diff.o
/usr/local/clang4/bin/clang -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG -I../inst/include -I"/Library/Frameworks/R.framework/Versions/3.4/Resources/library/zoo/include" -I/usr/local/include -fPIC -Wall -g -O2 -c dimnames.c -o dimnames.o
/usr/local/clang4/bin/clang -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG -I../inst/include -I"/Library/Frameworks/R.framework/Versions/3.4/Resources/library/zoo/include" -I/usr/local/include -fPIC -Wall -g -O2 -c leadingNA.c -o leadingNA.o
/usr/local/clang4/bin/clang -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG -I../inst/include -I"/Library/Frameworks/R.framework/Versions/3.4/Resources/library/zoo/include" -I/usr/local/include -fPIC -Wall -g -O2 -c merge.c -o merge.o
gfortran -fPIC -g -O2 -c period.max.f -o period.max.o
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:1:9: error: unsupported directive '.stabs'
.stabs "/private/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T/RtmpumHSCA/R.INSTALL4c1e7561eb52/xts/src/",100,0,7,Ltext0
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:2:9: error: unsupported directive '.stabs'
.stabs "period.max.f",100,0,7,Ltext0
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:5:9: error: unsupported directive '.stabs'
.stabs "gcc2_compiled.",60,0,0,0
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:9:2: error: unknown directive
.stabd 68,0,12
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:19:2: error: unknown directive
.stabd 68,0,12
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:29:2: error: unknown directive
.stabd 68,0,34
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:33:2: error: unknown directive
.stabd 68,0,12
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:36:2: error: unknown directive
.stabd 68,0,34
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:47:2: error: unknown directive
.stabd 68,0,38
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:68:2: error: unknown directive
.stabd 68,0,42
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:73:2: error: unknown directive
.stabd 68,0,38
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:80:2: error: unknown directive
.stabd 68,0,39
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:85:2: error: unknown directive
.stabd 68,0,42
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:88:2: error: unknown directive
.stabd 68,0,38
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:90:2: error: unknown directive
.stabd 68,0,39
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:92:2: error: unknown directive
.stabd 68,0,38
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:101:2: error: unknown directive
.stabd 68,0,49
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:105:2: error: unknown directive
.stabd 68,0,34
^
...
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:140:9: error: unsupported directive '.stabs'
.stabs "j:r(0,4)",64,0,24,0
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:141:2: error: unknown directive
.stabn 192,0,0,LBB2
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:142:2: error: unknown directive
.stabn 224,0,0,LBE2
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:143:9: error: unsupported directive '.stabs'
.stabs "pos:(0,4)",128,0,25,-12
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:144:9: error: unsupported directive '.stabs'
.stabs "j:r(0,4)",64,0,24,0
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:145:2: error: unknown directive
.stabn 192,0,0,LBB10
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:146:2: error: unknown directive
.stabn 224,0,0,LBE10
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:148:9: error: unsupported directive '.stabs'
.stabs "",36,0,0,Lscope1-LFBB1
^
/var/folders/y1/7zsj8_x973n4xjwg5gg6s53jr4zz65/T//ccwtKwZR.s:149:9: error: unsupported directive '.stabs'
.stabs "",100,0,0,Letext0
^
make: *** [period.max.o] Error 1
ERROR: compilation failed for package ‘xts’
removing ‘/Library/Frameworks/R.framework/Versions/3.4/Resources/library/xts’
Warning in install.packages : installation of package ‘xts’ had non-zero exit status
e：我在这里找到了我的解决方案：http://thecoatlessprofessor.com/programming/rcpp-rcpparmadillo-and-os-x-mavericks-lgfortran-and-lquadmath-error/