What is going on?

[The Doctor]

When I  try to update a port, I get

Cleaning for fftw3-float-3.3.5
===>  License GPLv2 accepted by the user
===>  Found saved configuration for fftw3-float-3.3.5
===>   fftw3-float-3.3.5 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by fftw3-float-3.3.5 for building
===>  Extracting for fftw3-float-3.3.5
=> SHA256 Checksum OK for fftw-3.3.5.tar.gz.
===>  Patching for fftw3-float-3.3.5
===>  Applying extra patch /usr/ports/math/fftw3-float/../../math/fftw3/files/extrapatch-tests_fftw-bench.c
===>  Applying FreeBSD patches for fftw3-float-3.3.5
===>   fftw3-float-3.3.5 depends on package: pkgconf>=0.9.10 - found
===>   fftw3-float-3.3.5 depends on executable: gcc48 - found
===>   fftw3-float-3.3.5 depends on file: /usr/local/bin/as - found
===>   fftw3-float-3.3.5 depends on package: perl5>=5.24<5.25 - found
===>  Configuring for fftw3-float-3.3.5
configure: loading site script /usr/ports/Templates/config.site
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... (cached) /bin/mkdir -p
checking for gawk... (cached) /usr/bin/awk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether to enable maintainer-specific portions of Makefiles... no
checking build system type... amd64-portbld-freebsd11.0
checking host system type... amd64-portbld-freebsd11.0
checking for gcc... gcc48
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc48 accepts -g... yes
checking for gcc48 option to accept ISO C89... none needed
checking whether gcc48 understands -c and -o together... yes
checking for style of include used by make... GNU
checking dependency style of gcc48... gcc3
checking for C compiler vendor... gnu
checking for gcc48 option to accept ISO C99... -std=gnu99
checking for gcc48 -std=gnu99 option to accept ISO Standard C... (cached) -std=gnu99
checking whether ln -s works... yes
checking whether make sets $(MAKE)... (cached) yes
checking how to print strings... printf
checking for a sed that does not truncate output... (cached) /usr/bin/sed
checking for grep that handles long lines and -e... (cached) /usr/bin/grep
checking for egrep... (cached) /usr/bin/egrep
checking for fgrep... (cached) /usr/bin/fgrep
checking for ld used by gcc48 -std=gnu99... /usr/local/bin/ld
checking if the linker (/usr/local/bin/ld) is GNU ld... yes
checking for BSD- or MS-compatible name lister (nm)... /usr/local/bin/nm
checking the name lister (/usr/local/bin/nm) interface... BSD nm
checking the maximum length of command line arguments... (cached) 262144
checking whether the shell understands some XSI constructs... yes
checking whether the shell understands "+="... no
checking how to convert amd64-portbld-freebsd11.0 file names to amd64-portbld-freebsd11.0 format... func_convert_file_noop
checking how to convert amd64-portbld-freebsd11.0 file names to toolchain format... func_convert_file_noop
checking for /usr/local/bin/ld option to reload object files... -r
checking for objdump... /usr/local/bin/objdump
checking how to recognize dependent libraries... pass_all
checking for dlltool... dlltool
checking how to associate runtime and link libraries... printf %s\n
checking for archiver @FILE support... @
checking for strip... strip
checking for ranlib... /usr/local/bin/ranlib
checking command to parse /usr/local/bin/nm output from gcc48 -std=gnu99 object... ok
checking for sysroot... no
checking for mt... mt
checking if mt is a manifest tool... no
checking how to run the C preprocessor... cpp48
checking for ANSI C header files... (cached) yes
checking for sys/types.h... (cached) yes
checking for sys/stat.h... (cached) yes
checking for stdlib.h... (cached) yes
checking for string.h... (cached) yes
checking for memory.h... (cached) yes
checking for strings.h... (cached) yes
checking for inttypes.h... (cached) yes
checking for stdint.h... (cached) yes
checking for unistd.h... (cached) yes
checking for dlfcn.h... (cached) yes
checking for objdir... .libs
checking if gcc48 -std=gnu99 supports -fno-rtti -fno-exceptions... no
checking for gcc48 -std=gnu99 option to produce PIC... -fPIC -DPIC
checking if gcc48 -std=gnu99 PIC flag -fPIC -DPIC works... yes
checking if gcc48 -std=gnu99 static flag -static works... yes
checking if gcc48 -std=gnu99 supports -c -o file.o... yes
checking if gcc48 -std=gnu99 supports -c -o file.o... (cached) yes
checking whether the gcc48 -std=gnu99 linker (/usr/local/bin/ld) supports shared libraries... yes
checking whether -lc should be explicitly linked in... no
checking dynamic linker characteristics... freebsd11.0 ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
checking for ocamlbuild... no
checking whether C compiler accepts -msse... yes
checking for ANSI C header files... (cached) yes
checking libintl.h usability... yes
checking libintl.h presence... yes
checking for libintl.h... yes
checking for malloc.h... (cached) no
checking for stddef.h... (cached) yes
checking for stdlib.h... (cached) yes
checking for string.h... (cached) yes
checking for strings.h... (cached) yes
checking for sys/time.h... (cached) yes
checking for unistd.h... (cached) yes
checking for limits.h... (cached) yes
checking c_asm.h usability... no
checking c_asm.h presence... no
checking for c_asm.h... no
checking intrinsics.h usability... no
checking intrinsics.h presence... no
checking for intrinsics.h... no
checking for stdint.h... (cached) yes
checking mach/mach_time.h usability... no
checking mach/mach_time.h presence... no
checking for mach/mach_time.h... no
checking sys/sysctl.h usability... yes
checking sys/sysctl.h presence... yes
checking for sys/sysctl.h... yes
checking altivec.h usability... no
checking altivec.h presence... no
checking for altivec.h... no
checking for an ANSI C-conforming const... yes
checking for inline... inline
checking for size_t... (cached) yes
checking whether time.h and sys/time.h may both be included... yes
checking for long double... (cached) yes
checking for hrtime_t... no
checking size of int... 4
checking size of unsigned int... 4
checking size of long... 8
checking size of unsigned long... 8
checking size of long long... 8
checking size of unsigned long long... 8
checking size of size_t... 8
checking size of ptrdiff_t... 8
checking for uintptr_t... (cached) yes
checking size of float... 4
checking size of double... 8
checking size of fftw_r2r_kind... 4
checking for working alloca.h... no
checking for alloca... yes
checking for working strtod... yes
checking for vprintf... (cached) yes
checking for _doprnt... no
checking for sin in -lm... yes
checking for BSDgettimeofday... no
checking for gettimeofday... (cached) yes
checking for gethrtime... no
checking for read_real_time... no
checking for time_base_to_time... no
checking for drand48... yes
checking for sqrt... yes
checking for memset... (cached) yes
checking for posix_memalign... yes
checking for memalign... no
checking for _mm_malloc... no
checking for _mm_free... no
checking for clock_gettime... (cached) yes
checking for mach_absolute_time... no
checking for sysctl... yes
checking for abort... yes
checking for sinl... yes
checking for cosl... yes
checking for snprintf... (cached) yes
checking whether sinl is declared... yes
checking whether cosl is declared... yes
checking whether sinq is declared... no
checking whether cosq is declared... no
checking whether memalign is declared... no
checking whether drand48 is declared... yes
checking whether srand48 is declared... yes
checking whether posix_memalign is declared... yes
checking for _rtc intrinsic... no
checking for isnan... yes
checking whether C compiler accepts -mpreferred-stack-boundary=4... yes
checking whether the stack is at least 8-byte aligned by gcc... checking whether C compiler accepts -malign-double... yes
yes
checking for OpenMP flag of C compiler... -fopenmp
checking for Win32 threads... no
checking for the pthreads library -lpthreads... no
checking whether pthreads work without any flags... no
checking whether pthreads work with -Kthread... no
checking whether pthreads work with -kthread... no
checking for the pthreads library -llthread... no
checking whether pthreads work with -pthread... no
checking whether pthreads work with -pthreads... no
checking whether pthreads work with -mt... no
checking whether pthreads work with -mthreads... no
checking for the pthreads library -lpthread... no
checking whether pthreads work with --thread-safe... no
checking for pthread-config... no
configure: error: couldn't find threads library for --enable-threads
===>  Script "configure" failed unexpectedly.
Please report the problem to jhale at FreeBSD.org [maintainer] and attach the
"/usr/ports/math/fftw3-float/work/fftw-3.3.5/config.log" including the output
of the failure of your make command. Also, it might be a good idea to provide
an overview of all packages installed on your system (e.g. a
/usr/local/sbin/pkg-static info -g -Ea).
*** Error code 1

Stop.
make[1]: stopped in /usr/ports/math/fftw3-float
*** Error code 1

Stop.
make: stopped in /usr/ports/math/fftw3-float

===>>> make build failed for math/fftw3-float
===>>> Aborting update

===>>> Update for math/fftw3-float failed
===>>> Aborting update

Same result happens when I try to compile php 7.0.13RC1 \

with a threaded Apache.

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