Libtool is installed, but it doesn't work

Question

I have both libtool and lib32-libltdl installed on my Arch x86_64 machine, but nothing that requires them compiles from AUR. That includes things like libpng12 and msgpack-git-neovim, which were building perfectly a couple of weeks ago (and I didn't change anything major since then). The same packages compile on my Arch ARM Raspberry Pi just fine, so it's not a problem with the packages themselves.
This is the output of yaourt during the build:
==> Extracting sources...
-> Extracting libpng-1.2.52.tar.xz with bsdtar
-> Extracting libpng-1.2.52-apng.patch.gz with gzip
==> Starting build()...
patching file pngread.c
patching file pngget.c
patching file png.c
patching file png.h
patching file pngwrite.c
patching file pngconf.h
patching file pngpread.c
patching file pngset.c
patching file pngrutil.c
patching file pngwutil.c
libtoolize: putting auxiliary files in '.'.
libtoolize: copying file './ltmain.sh'
libtoolize: You should add the contents of the following files to 'aclocal.m4':
libtoolize: '/usr/share/aclocal/libtool.m4'
libtoolize: '/usr/share/aclocal/ltoptions.m4'
libtoolize: '/usr/share/aclocal/ltversion.m4'
libtoolize: Consider adding 'AC_CONFIG_MACRO_DIRS([m4])' to configure.ac,
libtoolize: and rerunning libtoolize and aclocal.
libtoolize: Consider adding '-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
configure.ac:38: error: possibly undefined macro: AC_PROG_LD
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.
configure.ac:41: error: possibly undefined macro: AC_LIBTOOL_WIN32_DLL
configure.ac:45: error: possibly undefined macro: AC_PROG_LIBTOOL
==> ERROR: A failure occurred in build().
Aborting...
==> ERROR: Makepkg was unable to build libpng12.
Output lines from libtoolize are the same on the RPi, but it doesn't throw any errors after them.
Of course I tried force-reinstalling both libtools, but it didn't help.
What should I do to fix this?

Answer 1

$ ls -l /usr/bin/aclocal
-rwxr-xr-x 2 root root 36792 Jan 25 14:34 /usr/bin/aclocal
$ aclocal --print-ac-dir
/usr/local/share/aclocal
$ pacman -Qo /usr/share/aclocal/libtool.m4
/usr/share/aclocal/libtool.m4 is owned by libtool 2.4.5-1
$ pacman -Qo /usr/bin/aclocal
/usr/bin/aclocal is owned by automake 1.15-1
==> Making package: libpng12 1.2.52-1 (Thu Feb 26 21:51:27 NOVT 2015)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
-> Found libpng-1.2.52.tar.xz
-> Found libpng-1.2.52-apng.patch.gz
==> Validating source files with md5sums...
libpng-1.2.52.tar.xz ... Passed
libpng-1.2.52-apng.patch.gz ... Passed
==> Extracting sources...
-> Extracting libpng-1.2.52.tar.xz with bsdtar
-> Extracting libpng-1.2.52-apng.patch.gz with gzip
==> Removing existing $pkgdir/ directory...
==> Starting build()...
patching file pngread.c
patching file pngget.c
patching file png.c
patching file png.h
patching file pngwrite.c
patching file pngconf.h
patching file pngpread.c
patching file pngset.c
patching file pngrutil.c
patching file pngwutil.c
libtoolize: putting auxiliary files in '.'.
libtoolize: copying file './ltmain.sh'
libtoolize: You should add the contents of the following files to 'aclocal.m4':
libtoolize: '/usr/share/aclocal/libtool.m4'
libtoolize: '/usr/share/aclocal/ltoptions.m4'
libtoolize: '/usr/share/aclocal/ltversion.m4'
libtoolize: Consider adding 'AC_CONFIG_MACRO_DIRS([m4])' to configure.ac,
libtoolize: and rerunning libtoolize and aclocal.
libtoolize: Consider adding '-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
/usr/local/share/aclocal
aclocal: found macro AM_PROG_VALAC in /usr/local/share/aclocal-1.14/vala.m4: 21
aclocal: found macro AM_PROG_UPC in /usr/local/share/aclocal-1.14/upc.m4: 9
aclocal: found macro _AM_PROG_TAR in /usr/local/share/aclocal-1.14/tar.m4: 23
aclocal: found macro _AM_SUBST_NOTMAKE in /usr/local/share/aclocal-1.14/substnot.m4: 12
aclocal: found macro AM_SUBST_NOTMAKE in /usr/local/share/aclocal-1.14/substnot.m4: 17
aclocal: found macro AM_PROG_INSTALL_STRIP in /usr/local/share/aclocal-1.14/strip.m4: 17
aclocal: found macro AM_SILENT_RULES in /usr/local/share/aclocal-1.14/silent.m4: 12
aclocal: found macro AM_SANITY_CHECK in /usr/local/share/aclocal-1.14/sanity.m4: 11
aclocal: found macro AM_RUN_LOG in /usr/local/share/aclocal-1.14/runlog.m4: 12
aclocal: found macro AM_PATH_PYTHON in /usr/local/share/aclocal-1.14/python.m4: 35
aclocal: found macro AM_PYTHON_CHECK_VERSION in /usr/local/share/aclocal-1.14/python.m4: 229
aclocal: found macro _AM_PROG_CC_C_O in /usr/local/share/aclocal-1.14/prog-cc-c-o.m4: 12
aclocal: found macro AM_PROG_CC_C_O in /usr/local/share/aclocal-1.14/prog-cc-c-o.m4: 47
aclocal: found macro _AM_MANGLE_OPTION in /usr/local/share/aclocal-1.14/options.m4: 11
aclocal: found macro _AM_SET_OPTION in /usr/local/share/aclocal-1.14/options.m4: 17
aclocal: found macro _AM_SET_OPTIONS in /usr/local/share/aclocal-1.14/options.m4: 23
aclocal: found macro _AM_IF_OPTION in /usr/local/share/aclocal-1.14/options.m4: 29
aclocal: found macro AM_CONFIG_HEADER in /usr/local/share/aclocal-1.14/obsolete.m4: 11
aclocal: found macro AM_PROG_CC_STDC in /usr/local/share/aclocal-1.14/obsolete.m4: 17
aclocal: found macro AM_C_PROTOTYPES in /usr/local/share/aclocal-1.14/obsolete.m4: 26
aclocal: found macro fp_C_PROTOTYPES in /usr/local/share/aclocal-1.14/obsolete.m4: 28
aclocal: found macro AM_PROG_MKDIR_P in /usr/local/share/aclocal-1.14/mkdirp.m4: 11
aclocal: found macro AM_MISSING_PROG in /usr/local/share/aclocal-1.14/missing.m4: 11
aclocal: found macro AM_MISSING_HAS_RUN in /usr/local/share/aclocal-1.14/missing.m4: 20
aclocal: found macro AM_MAKE_INCLUDE in /usr/local/share/aclocal-1.14/make.m4: 12
aclocal: found macro AM_MAINTAINER_MODE in /usr/local/share/aclocal-1.14/maintainer.m4: 16
aclocal: found macro AM_PATH_LISPDIR in /usr/local/share/aclocal-1.14/lispdir.m4: 14
aclocal: found macro AM_PROG_LEX in /usr/local/share/aclocal-1.14/lex.m4: 13
aclocal: found macro AM_SET_LEADING_DOT in /usr/local/share/aclocal-1.14/lead-dot.m4: 10
aclocal: found macro AM_PROG_INSTALL_SH in /usr/local/share/aclocal-1.14/install-sh.m4: 11
aclocal: found macro AM_INIT_AUTOMAKE in /usr/local/share/aclocal-1.14/init.m4: 29
aclocal: found macro _AC_AM_CONFIG_HEADER_HOOK in /usr/local/share/aclocal-1.14/init.m4: 182
aclocal: found macro AM_PROG_GCJ in /usr/local/share/aclocal-1.14/gcj.m4: 10
aclocal: found macro AM_EXTRA_RECURSIVE_TARGETS in /usr/local/share/aclocal-1.14/extra-recurs.m4: 16
aclocal: found macro AM_WITH_DMALLOC in /usr/local/share/aclocal-1.14/dmalloc.m4: 12
aclocal: found macro _AM_OUTPUT_DEPENDENCY_COMMANDS in /usr/local/share/aclocal-1.14/depout.m4: 12
aclocal: found macro AM_OUTPUT_DEPENDENCY_COMMANDS in /usr/local/share/aclocal-1.14/depout.m4: 71
aclocal: found macro _AM_DEPENDENCIES in /usr/local/share/aclocal-1.14/depend.m4: 26
aclocal: found macro AM_SET_DEPDIR in /usr/local/share/aclocal-1.14/depend.m4: 163
aclocal: found macro AM_DEP_TRACK in /usr/local/share/aclocal-1.14/depend.m4: 171
aclocal: found macro AM_CONDITIONAL in /usr/local/share/aclocal-1.14/cond.m4: 12
aclocal: found macro AM_COND_IF in /usr/local/share/aclocal-1.14/cond-if.m4: 23
aclocal: found macro AM_AUX_DIR_EXPAND in /usr/local/share/aclocal-1.14/auxdir.m4: 47
aclocal: found macro AM_PROG_AS in /usr/local/share/aclocal-1.14/as.m4: 11
aclocal: found macro AM_PROG_AR in /usr/local/share/aclocal-1.14/ar-lib.m4: 13
aclocal: found macro AM_AUTOMAKE_VERSION in /usr/local/share/aclocal-1.14/amversion.m4: 14
aclocal: found macro AM_SET_CURRENT_AUTOMAKE_VERSION in /usr/local/share/aclocal-1.14/amversion.m4: 33
aclocal: saw macro AM_INIT_AUTOMAKE
aclocal: saw macro _AM_PROG_CC_C_O
aclocal: saw macro _AM_PROG_CC_C_O
aclocal: saw macro AM_AUX_DIR_EXPAND
aclocal: saw macro AM_AUX_DIR_EXPAND
aclocal: saw macro AM_RUN_LOG
aclocal: saw macro AM_RUN_LOG
aclocal: saw macro AM_PROG_CC_C_O
aclocal: saw macro AM_AUX_DIR_EXPAND
aclocal: saw macro AM_INIT_AUTOMAKE
aclocal: saw macro AM_SET_CURRENT_AUTOMAKE_VERSION
aclocal: saw macro AM_AUTOMAKE_VERSION
aclocal: saw macro AM_INIT_AUTOMAKE
aclocal: saw macro AM_SET_CURRENT_AUTOMAKE_VERSION
aclocal: saw macro AM_AUTOMAKE_VERSION
aclocal: saw macro _AM_SUBST_NOTMAKE
aclocal: saw macro _AM_SUBST_NOTMAKE
aclocal: saw macro _AM_SUBST_NOTMAKE
aclocal: saw macro AM_SUBST_NOTMAKE
aclocal: saw macro _AM_SET_OPTION
aclocal: saw macro _AM_MANGLE_OPTION
aclocal: saw macro _AM_SET_OPTION
aclocal: saw macro _AM_MANGLE_OPTION
aclocal: saw macro _AM_SET_OPTIONS
aclocal: saw macro _AM_SET_OPTION
aclocal: saw macro _AM_IF_OPTION
aclocal: saw macro _AM_MANGLE_OPTION
aclocal: saw macro _AM_SET_OPTIONS
aclocal: saw macro _AM_IF_OPTION
aclocal: saw macro AM_SANITY_CHECK
aclocal: saw macro AM_SANITY_CHECK
aclocal: saw macro AM_MISSING_PROG
aclocal: saw macro AM_MISSING_PROG
aclocal: saw macro AM_MISSING_HAS_RUN
aclocal: saw macro AM_MISSING_HAS_RUN
aclocal: saw macro AM_AUX_DIR_EXPAND
aclocal: saw macro AM_MISSING_HAS_RUN
aclocal: saw macro AM_AUX_DIR_EXPAND
aclocal: saw macro AM_MISSING_PROG
aclocal: saw macro AM_MISSING_PROG
aclocal: saw macro AM_MISSING_PROG
aclocal: saw macro AM_MISSING_PROG
aclocal: saw macro AM_PROG_INSTALL_SH
aclocal: saw macro AM_PROG_INSTALL_SH
aclocal: saw macro AM_AUX_DIR_EXPAND
aclocal: saw macro AM_AUX_DIR_EXPAND
aclocal: saw macro AM_PROG_INSTALL_STRIP
aclocal: saw macro AM_PROG_INSTALL_STRIP
aclocal: saw macro AM_PROG_INSTALL_SH
aclocal: saw macro AM_PROG_INSTALL_SH
aclocal: saw macro AM_SET_LEADING_DOT
aclocal: saw macro AM_SET_LEADING_DOT
aclocal: saw macro _AM_PROG_TAR
aclocal: saw macro _AM_PROG_TAR
aclocal: saw macro AM_RUN_LOG
aclocal: saw macro AM_RUN_LOG
aclocal: saw macro AM_RUN_LOG
aclocal: saw macro AM_RUN_LOG
aclocal: saw macro _AM_IF_OPTION
aclocal: saw macro _AM_PROG_TAR
aclocal: saw macro _AM_IF_OPTION
aclocal: saw macro _AM_PROG_TAR
aclocal: saw macro _AM_IF_OPTION
aclocal: saw macro _AM_DEPENDENCIES
aclocal: saw macro _AM_DEPENDENCIES
aclocal: saw macro AM_SET_DEPDIR
aclocal: saw macro AM_OUTPUT_DEPENDENCY_COMMANDS
aclocal: saw macro _AM_OUTPUT_DEPENDENCY_COMMANDS
aclocal: saw macro AM_OUTPUT_DEPENDENCY_COMMANDS
aclocal: saw macro _AM_OUTPUT_DEPENDENCY_COMMANDS
aclocal: saw macro AM_MAKE_INCLUDE
aclocal: saw macro AM_MAKE_INCLUDE
aclocal: saw macro AM_DEP_TRACK
aclocal: saw macro AM_CONDITIONAL
aclocal: saw macro AM_CONDITIONAL
aclocal: saw macro _AM_SUBST_NOTMAKE
aclocal: saw macro _AM_SUBST_NOTMAKE
aclocal: saw macro AM_SET_DEPDIR
aclocal: saw macro AM_SET_LEADING_DOT
aclocal: saw macro AM_DEP_TRACK
aclocal: saw macro AM_CONDITIONAL
aclocal: saw macro _AM_SUBST_NOTMAKE
aclocal: saw macro _AM_SUBST_NOTMAKE
aclocal: saw macro AM_SET_DEPDIR
aclocal: saw macro AM_OUTPUT_DEPENDENCY_COMMANDS
aclocal: saw macro AM_MAKE_INCLUDE
aclocal: saw macro AM_DEP_TRACK
aclocal: saw macro AM_SET_LEADING_DOT
aclocal: saw macro _AM_DEPENDENCIES
aclocal: saw macro _AM_DEPENDENCIES
aclocal: saw macro _AM_DEPENDENCIES
aclocal: saw macro _AM_DEPENDENCIES
aclocal: saw macro _AM_DEPENDENCIES
aclocal: saw macro _AM_DEPENDENCIES
aclocal: saw macro _AM_DEPENDENCIES
aclocal: saw macro AM_SILENT_RULES
aclocal: saw macro AM_SILENT_RULES
aclocal: saw macro AM_SUBST_NOTMAKE
aclocal: saw macro AM_SUBST_NOTMAKE
aclocal: saw macro _AM_SUBST_NOTMAKE
aclocal: saw macro AM_CONDITIONAL
aclocal: saw macro _AC_AM_CONFIG_HEADER_HOOK
aclocal: saw macro AM_SET_CURRENT_AUTOMAKE_VERSION
aclocal: saw macro AM_SANITY_CHECK
aclocal: saw macro AM_PROG_INSTALL_SH
aclocal: saw macro AM_PROG_INSTALL_STRIP
aclocal: saw macro AM_SET_LEADING_DOT
aclocal: saw macro AM_SILENT_RULES
aclocal: saw macro AM_MAINTAINER_MODE
aclocal: saw macro AM_MAINTAINER_MODE
aclocal: saw macro AM_CONDITIONAL
aclocal: saw macro AM_CONDITIONAL
aclocal: running echo 'm4_define([m4_require_silent_probe], [-])' | autom4te --language Autoconf-without-aclocal-m4 - /usr/local/share/aclocal-1.14/internal/ac-config-macro-dirs.m4 '/usr/local/share/aclocal-1.14/amversion.m4' '/usr/local/share/aclocal-1.14/auxdir.m4' '/usr/local/share/aclocal-1.14/cond.m4' '/usr/local/share/aclocal-1.14/depend.m4' '/usr/local/share/aclocal-1.14/depout.m4' '/usr/local/share/aclocal-1.14/init.m4' '/usr/local/share/aclocal-1.14/install-sh.m4' '/usr/local/share/aclocal-1.14/lead-dot.m4' '/usr/local/share/aclocal-1.14/maintainer.m4' '/usr/local/share/aclocal-1.14/make.m4' '/usr/local/share/aclocal-1.14/missing.m4' '/usr/local/share/aclocal-1.14/options.m4' '/usr/local/share/aclocal-1.14/prog-cc-c-o.m4' '/usr/local/share/aclocal-1.14/runlog.m4' '/usr/local/share/aclocal-1.14/sanity.m4' '/usr/local/share/aclocal-1.14/silent.m4' '/usr/local/share/aclocal-1.14/strip.m4' '/usr/local/share/aclocal-1.14/substnot.m4' '/usr/local/share/aclocal-1.14/tar.m4' --trace='AC_DEFUN:$f::$n::${::}%' --trace='AC_DEFUN_ONCE:$f::$n::${::}%' --trace='AU_DEFUN:$f::$n::${::}%' --trace='_AM_AUTOCONF_VERSION:$f::$n::${::}%' --trace='AC_CONFIG_MACRO_DIR_TRACE:$f::$n::${::}%' --trace='AC_CONFIG_MACRO_DIR:$f::$n::${::}%' --trace='_AM_CONFIG_MACRO_DIRS:$f::$n::${::}%' --trace='_AM_SUBST_NOTMAKE:$f::$n' --trace='AM_DEP_TRACK:$f::$n' --trace='AM_SET_DEPDIR:$f::$n' --trace='AM_SET_LEADING_DOT:$f::$n' --trace='AM_PROG_INSTALL_SH:$f::$n' --trace='AM_MISSING_PROG:$f::$n' --trace='_AM_PROG_TAR:$f::$n' --trace='_AM_IF_OPTION:$f::$n' --trace='AM_MAINTAINER_MODE:$f::$n' --trace='AM_AUTOMAKE_VERSION:$f::$n' --trace='AM_CONDITIONAL:$f::$n' --trace='_AM_DEPENDENCIES:$f::$n' --trace='_AM_OUTPUT_DEPENDENCY_COMMANDS:$f::$n' --trace='AM_PROG_CC_C_O:$f::$n' --trace='AM_RUN_LOG:$f::$n' --trace='AM_SANITY_CHECK:$f::$n' --trace='_AC_AM_CONFIG_HEADER_HOOK:$f::$n' --trace='AM_MAKE_INCLUDE:$f::$n' --trace='AM_SILENT_RULES:$f::$n' --trace='AM_OUTPUT_DEPENDENCY_COMMANDS:$f::$n' --trace='AM_SUBST_NOTMAKE:$f::$n' --trace='AM_AUX_DIR_EXPAND:$f::$n' --trace='_AM_SET_OPTIONS:$f::$n' --trace='AM_PROG_INSTALL_STRIP:$f::$n' --trace='_AM_MANGLE_OPTION:$f::$n' --trace='_AM_PROG_CC_C_O:$f::$n' --trace='AM_INIT_AUTOMAKE:$f::$n' --trace='_AM_SET_OPTION:$f::$n' --trace='AM_MISSING_HAS_RUN:$f::$n' --trace='AM_SET_CURRENT_AUTOMAKE_VERSION:$f::$n' configure.ac
aclocal: writing aclocal.m4
configure.ac:38: error: possibly undefined macro: AC_PROG_LD
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.
configure.ac:41: error: possibly undefined macro: AC_LIBTOOL_WIN32_DLL
configure.ac:45: error: possibly undefined macro: AC_PROG_LIBTOOL
==> ERROR: A failure occurred in build().
Aborting...